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  • 1.
    Albertini, G. Giuliani, A. Lin Peng, R. Manescu, A., Ponzetti, A.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Determination of the residual stress in a centrifuge bowl by neutron diffraction2002In: Applied Physics, Vol. A75, no 1Article in journal (Refereed)
  • 2.
    Albertini, G
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Peng, RL
    Manescu, A
    Ponzetti, A.
    Neutron diffraction measurement of residual stress in a centrifugal bowl of duplex steel2001In: J. Neutron Research, Vol. 9, p. 305-Article in journal (Other scientific)
  • 3.
    Almer, J. , U Lienert, R. L. Peng, C. Schlauer and M. Odén
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Strain and texture analysis of coatings using high-energy x-rays2003In: Journal of Applied Physics., Vol. 94(1), p. 697-702Article in journal (Refereed)
  • 4. Andreasson, Jakob
    et al.
    Holmlund, Joakim
    Knee, Christopher S.
    Käll, Mikael
    Börjesson, Lars
    Naler, Stefan
    Bäckström, Joakim
    Ruebhausen, Michael
    Azad, Abul Kalam
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Eriksson, Sten-G.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Franck-Condon higher order lattice excitations in the LaFe1-xCrxO3 (x=0, 0.1, 0.5, 0.9, 1.0) perovskites due to Fe-Cr charge transfer effects2007In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 10, p. 103402-Article in journal (Refereed)
    Abstract [en]

    First and higher order lattice excitations in the B-site disordered perovskites LaFe1-xCrxO3 (x=0, 0.1, 0.5, 0.9, and 1) and La0.835Sr0.165Fe0.5Cr0.5O3-delta are investigated using temperature dependent and polarized inelastic light scattering [lambda=515 nm (2.41 eV) and 676 nm (1.83 eV)] on oriented crystallites. A peak at approximately 2.4 eV in the imaginary part of the dielectric function of LaFe0.5Cr0.5O3 is assigned to a charge transfer from Fe3+ (d(5)) to Cr3+ (d(3)) ions, coupled with the appearance of an intense A(g)-like mode at approximately 700 cm(-1) in the Raman data. This excitation is identified as a symmetric oxygen breathing mode activated by the Fe-Cr charge transfer through an orbital coupling mechanism. Higher order scattering (up to seventh order) of the intrinsic Raman active symmetric breathing mode is also explained by an orbital-mediated electron-phonon coupling, similar to the Franck-Condon effect observed in the Jahn-Teller active-perovskite-structured manganite LaMaO(3). These results show that the Franck-Condon mechanism is a more common mechanism for resonant higher order scattering in solids than previously believed and propose the LaFe1-xCrxO3 system as a model system for electron-phonon coupling and higher order Raman scattering in solids.

  • 5.
    Azad, A. K. , S.-G. Eriksson
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Formation of a cubic Sr2MnWO6 phase at elevated temperature: a neutron powder diffraction study2003In: Solid State Communication, Vol. 126, p. 503-Article in journal (Refereed)
  • 6.
    Azad, A. K. , S.-G. Eriksson, S.A. Ivanov, J. Eriksen, H. Rundlöf
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Structural studies of the spinel system GaxCoFe1-xCrO4 (0 £ x £ 1) by neutron powder diffraction2003In: Materials Science Forum, 2003, Vol. 443-444, p. 325-Conference paper (Refereed)
  • 7.
    Azad, A. K., S.- G. Eriksson, S. A. Ivanov, H. Rundlöf, J. Eriksen, R. Mathieu, and P. Svedlindh
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Synthesis, Structure and Magnetic properties of Ca2-xSrxMnWO6 (x = 0.0, 0.5, 1.0, 1.5, 2.0)2003In: Materials Science Forum, 2003, Vol. 443-444, p. 375-Conference paper (Refereed)
  • 8.
    Azad, A. K., S.- G. Eriksson, S. M. Yunus, J. Eriksen, H. Rundlöf
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Synthesis, cation distribution and crystal structure of the spinel type solid solution GaxCoFe1-xCrO4 (0 < x < 1)2003In: Physica B, Vol. 327, p. 1-Article in journal (Refereed)
  • 9.
    Azad, A.K., Eriksson, S.-G., Mellergård, A. Ivanov, S.A., Eriksen, J. Rundlöf, H.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    A study on the nuclear and magnetic structure of the double perovskite A2FeWO6 (A = Sr, Ba) by neutron diffraction and reverse Monte Carlo modeling2002In: Materials Research Bulletin, Vol. 37, p. 1797-1813Article in journal (Refereed)
  • 10.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Eriksson, S-G
    Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science.
    Ivanov, H
    Rundlöf, H
    Eriksen, J
    Mathieu, R
    Svedlindh, P.
    Structural and magnetic characterisatrion of the double perovskite A2MnWO6 (AA'=Ba2, BaSr, Sr2, SrCa and Ca2)2001In: Ferroelectrics, Vol. in pressOther (Other scientific)
  • 11.
    Azad, A.K., Eriksson, S.-G., Ivanov, S.A., Rundlöf, H., Eriksen, J. Mathieu, R., Svedlindh, P.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Structural and magnetic characterization of the double perovskites AA´MnWO6 (AA´= Ba2, SrBa, Sr2, SrCa and Ca2)2002In: Ferroelectrics, Vol. 269, p. 105-110Article in journal (Refereed)
  • 12.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksson, S-G
    Mellergård, A
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, SA
    Eriksen, J
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    A study on the nuclear and magnetic structure of the double perovskite A1FeWO6 (A=Sr, Ba) by neutron diffraction and reverse Monte Carlo modelling2001In: J. Phys.; Condensed Matter, Vol. submittedArticle in journal (Refereed)
  • 13.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksson, S-G
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Yunus, SM
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Synthesis, cation distribution and crystal structure of the spinel type solid solution GaxCoFe1-xCrO4 (0<x<1)2003In: Physica B, Vol. B 327, p. 1-8Article in journal (Refereed)
  • 14.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, SA
    Eriksson, SG
    Technology, Department of Materials Science. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Mathieu, R
    Svedlindh, P
    Nuclear and magnetic structure of Ca2MnWO6: A neutron powder diffraction study2001In: MATERIALS RESEARCH BULLETIN, ISSN 0025-5408, Vol. 36, no 13-14, p. 2485-2496Article in journal (Refereed)
    Abstract [en]

    The nuclear and magnetic structures of the double provskite compound Ca2MnWO6 have been determined by neutron powder diffraction. Rietveld refinement shows that the compound adopts a monoclinic crystal structure with P2(1)/n symmetry. Magnetic refinement

  • 15.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, SA
    Eriksson, S-G
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Mathieu, R
    Svedlindh, P
    Structural and magnetic properties of the double perovskite Sr2MnWO62001In: J. Magnetism and Magnetic Materials, Vol. 237, p. 124-Article in journal (Refereed)
  • 16.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, SA
    Eriksson, SG
    Technology, Department of Materials Science. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Mathieu, R
    Svedlindh, P
    Synthesis, crystal structure, and magnetic characterization of the double perovskite Ba2MnWO62001In: MATERIALS RESEARCH BULLETIN, ISSN 0025-5408, Vol. 36, no 12, p. 2215-2228Article in journal (Refereed)
    Abstract [en]

    The double perovskite Ba2MnWO6 has been prepared as a pure powder by a conventional solid-state reaction process and studied by X-ray, neutron powder diffraction (NPD), magnetization, and AC susceptibility measurements. NPD, magnetization, and AC suscepti

  • 17.
    Azad, A.K., Mellergård, A., Eriksson, S.-G., Ivanov, S.A., Eriksen, J. and Rundlöf, H.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Preparation, crystal and magnetic structure of the double perovskite Ba2FeWo62002In: Applied Physics, Vol. A74, p. 763-765Article in journal (Refereed)
  • 18.
    Azad, AK
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Mellergård, A
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksson, S-G
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, SA
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Preparation, Crystal and Magnetic Structure of the Double Perovskite Ba2FeWO62002In: Applied Physics A, Vol. A 74, p. S763-765Article in journal (Refereed)
    Abstract [en]

    Single-phase polycrystalline material of the double perovskite Ba2FeWO6 was prepared and characterized by X-ray and neutron powder diffraction (NPD). The crystal structure was tetragonal with lattice parameters a=b=5.7479(4) Å and c=8.1444(9) Å at room temperature (295 K). NPD data at 10 K shows the evidence of an antiferromagnetic ordering of the Fe atoms. The reverse Monte Carlo powder (RMCPOW) technique was used to find the magnetic structure, which showed that it is based on a unit cell related to that of the nuclear structure by the propagation vector 0 \frac[¯]1[¯][¯]2[¯] \frac[¯]1[¯][¯]2[¯] . An ordering of collinear spins was found with alternate layers in the c-direction or in the a-b plane. The model was checked by Rietveld refinement and the magnetic moment of iron was found to be 3.39(2)7B at 10 K.

  • 19.
    Azad, A.K., S.-G. Eriksson, S.A. Ivanov, R. Mathieu, P. Svedlindh, J. Eriksen, H. Rundlöf,
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Synthesis, structural and magnetic characterisation of the double perovskite A2MnMoO6 (A=Ba, Sr)2003In: Materials Research Bulletin, Vol. 37, p. 1797-Article in journal (Refereed)
  • 20.
    Bachlechner, ME
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Omeltchenko, A
    Nakano, A
    Kalia, RK
    Vashishta, P
    Ebbsjo, I
    Madhukar, A
    Dislocation emission at the silicon/silicon nitride interface: A million atom molecular dynamics simulation on parallel computers2000In: PHYSICAL REVIEW LETTERS, ISSN 0031-9007, Vol. 84, no 2, p. 322-325Article in journal (Refereed)
    Abstract [en]

    Mechanical behavior of the Si(111)/Si3N4(0001) interface is studied using million atom molecular dynamics simulations, At a critical value of applied strain parallel to the interface, a crack forms on the silicon nitride surface and moves toward the inter

  • 21. Bashir, J.
    et al.
    Shaheen, R.
    Siddique, M.
    Azad, Abul Kalam
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Eriksen, Jytte
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Rundlöf, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    The influence of Cr doping on the structural and magnetic properties of Sr2Fe1-xCrxMoO6 double perovskite2006In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 385, p. 126-129Article in journal (Refereed)
    Abstract [en]

    We have studied the effect of Cr substitution for Fe in Sr2Fe1-xCr,MoO6 (x <= 0.3) double perovskites. X-ray diffraction, neutron powder diffraction (NPD), magnetisation measurements as well as Mossbauer spectroscopy have been used to determine the structural and magnetic properties of these compounds. All these materials were found to crystallise with tetragonal symmetry. The main observed effect is a decrease with respect to the undoped composition, of the cationic order with Cr doping levels. Mossbauer spectroscopy measurement revealed that iron exists in high spin + 3 oxidation state.

  • 22. Belushkin, A. V.
    et al.
    Kozlenko, D. P.
    Golosova, N. O.
    Zetterström, P.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Savenko, B. N.
    A study of disorder effects at ferroelectric phase transition in BaTiO32006In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 385, p. 85-87Article in journal (Refereed)
    Abstract [en]

    The total structure factor of BaTiO3 obtained by neutron powder diffraction in the temperature range 360-430 K in the vicinity of ferroelectric phase transition has been modeled by the reverse Monte Carlo method. A presence of disordered displacements of Ti atoms due to dynamical tetragonal elongations of unit cells and off-centered sites of Ti atoms in paraelectric phase in the vicinity of the ferroelectric phase transition was observed. Both features result in the anomalous increase of mean square displacements of Ti atoms and reflect the coexistence of displacive and order-disorder components in the ferroelectric phase transition.

  • 23.
    Belushkin, AV
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Kozlenko, DP
    McGreevy, RL
    Savenko, BN
    Zetterström, P
    A study of orientational disorder in ND4Cl by the reverse Monte Carlo method1999In: PHYSICA B, ISSN 0921-4526, Vol. 269, no 3-4, p. 297-303Article in journal (Other scientific)
    Abstract [en]

    The total structure factor for deuterated ammonium chloride measured by neutron diffraction has been modeled using the reverse Monte Carlo method. The results show that the orientational disorder of the ammonium ions consists of a local librational motion

  • 24.
    Belushkin, AV
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    McGreevy, RL
    Zetterström, P
    Shuvalov, LA
    Mechanism of superprotonic conductivity in CsHSO41998In: PHYSICA B, ISSN 0921-4526, Vol. 241-243, p. 323-325Article in journal (Other scientific)
    Abstract [en]

    Cesium hydrogen sulphate is one of the most extensively studied superprotonic conductors with hydrogen bonds. The first-order phase transition, from the low-conductivity to high conductivity phase takes place at 414 K. The crystallographic structure of bo

  • 25.
    Berastegui, P
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Hull, S
    Eriksson, S-G
    A low temperature structural phase transition in CsPbF32001In: J. Phys.: Condensed Matter, Vol. 13, p. 5077-Article in journal (Refereed)
  • 26.
    Berastegui, P., Hull, S., Garcia-Garcia, F. J. and Eriksson, S.- G.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    The crystal structures, microstructures and ionic conductivity of Ba2In2O5 and Ba(InxHf1-x)O3-x/22002In: J. Solid State Chemistry, Vol. 164, p. 119-Article in journal (Refereed)
  • 27.
    Borg, S., Svensson, G. and Bovin, J. O.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Structure Study of Bi2.5Na0.5Ta2O9 and Bi2.5Nam-1.5NbmO3m+3 (m=2–4) by Neutron Powder Diffraction and Electron Microscopy2002In: J. Solid State Chem., Vol. 167, no 1, p. 86-Article in journal (Refereed)
  • 28.
    Borlado, CR
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Mompean, FJ
    Lin, R
    Izquierdo, J
    Roman, MA
    Serrano, VL
    Neutron strain scanning on bimetallic tubes2000In: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN 0921-5093, Vol. 288, no 2, p. 288-292Article in journal (Refereed)
    Abstract [en]

    Neutron diffraction measurements have been carried out on the REST diffractometer (Studsvik) on curved components fabricated by cold working bimetallic tubes. The tubes consist of two layers (an outer one of austenitic steel and an inner one of ferritic s

  • 29.
    Borlado, CR
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Mompean, FJ
    Peng, RL
    Monte Carlo simulation of a reactor-based neutron strain scanning diffractometer2001In: JOURNAL OF APPLIED CRYSTALLOGRAPHY, ISSN 0021-8898, Vol. 34, p. 613-624Article in journal (Refereed)
    Abstract [en]

    A Monte Carlo code for the simulation of neutron strain scanning experiments on a reactor-based two-axis diffractometer is described. In order to validate this code, several experiments have been performed. A comparison is made between experimental and si

  • 30.
    Borlado, CR
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Mompean, FJ
    Peng, RL
    Izquierdo, J
    de, Luis J
    Neutron strain scanning in bimetallic tubes: experimental and Monte Carlo simulation results2000In: PHYSICA B, ISSN 0921-4526, Vol. 276, p. 907-908Article in journal (Refereed)
    Abstract [en]

    Neutron strain scanning measurements have been performed on straight and curved parts of a component manufactured from bimetallic tubes. Instrumental and sample-related effects contributing to non-strain induced Bragg peak shifts have been corrected for b

  • 31.
    Butman, M..
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Wannberg, A.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Mellergård, A.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Zetterström, P.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    McGreevy, R.L.
    RAL, ISIS U.K..
    ADAA: New software for intelligent instrument control2004In: Proceedings of the Third European Conference on Neutron Scattering, 2004, p. E747-E749Conference paper (Refereed)
  • 32.
    Bäckström, J
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Engberg, D
    Mellergård, A
    Eriksson, S-G
    Osada, M
    Kakihana, M
    Delaplane, RG
    Börjesson, L
    Structural anomalies in nonsupersoncduction PrBa2Cu4O8 investigated by neutron diffraction and Reverse Monte Carlo modelling2001In: Phys. Rev. Lett., Vol. submittedArticle in journal (Refereed)
  • 33. Cong, D. Y.
    et al.
    Wang, Y. D.
    Xu, J. Z.
    Zuo, L.
    Zetterstroem, P.
    Delaplane, R.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Neutron diffraction study on crystal structure and phase transformation in Ni-Mn-Ga ferromagnetic shape memory alloys2007In: Powder Diffraction, ISSN 0885-7156, E-ISSN 1945-7413, Vol. 22, no 4, p. 307-311Article in journal (Refereed)
    Abstract [en]

    Crystal structure and phase transformation behaviors in two Ni-Mn-Ga ferromagnetic shape memory alloys (FSMAs) with compositions of Ni48Mn30Ga22 and Ni53Mn25Ga22 (at. %) as a function of temperature were investigated by in situ neutron diffraction experiments. Neutron diffraction technique proves to be highly efficient in characterizing structural transformation in Ni-Mn-Ga FSMAs, which consist of nearby elements in the periodic table. Our neutron results show that Ni48Mn30Ga22 has a cubic, L-21 Heusler structure from 373 to 293 K. Its crystal structure changes into a seven-layered orthorhombic martensitic structure when cooled to 243 K, and no further transformation is observed upon cooling to 19 K. Neutron diffraction results also show that Ni53Mn25Ga22 has a tetragonal 14/mmm martensitic structure from 20 to 403 K. A pre-transformation around room temperature is observed from an abrupt jump in unit-cell volume of Ni53Mn25Ga22, which corresponds with an endothermic peak detected in a heated DSC curve.

  • 34.
    Delaplane, R.G., Küppers, H., Noreland, J., Parker, S.F.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Dynamics of the water molecule in potassium oxalate monohydrate as studied by single crystal inelastic neutron scattering2002In: Appl. Phys, Vol. A 74, p. 1366-1367Article in journal (Refereed)
  • 35. Denys, R. V.
    et al.
    Riabov, A. B.
    Yartys, V. A.
    Sato, Masashi
    Delaplane, R. G.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Mg substitution effect on the hydrogenation behaviour, thermodynamic and structural properties of the La2Ni7-H(D)(2) system2008In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 181, no 4, p. 812-821Article in journal (Refereed)
    Abstract [en]

    The present work is focused on studies of the influence of magnesium on the hydrogenation behaviour of the (La,Mg)(2)Ni-7 alloys. Substitution of La in La2Ni7 by Mg to form La1.5Mg0.5Ni7 preserves the initial Ce2Ni7 type of the hexagonal P6(3)/mmc structure and leads to contraction of the unit cell. The system La1.5Mg0.5Ni7-H2 (D-2) was studied using in situ synchrotron X-ray and neutron powder diffraction in H-2/D-2 gas and pressure-composition-temperature measurements. La replacement by Mg was found to proceed in an ordered way, only within the Laves-type parts of the hybrid crystal structure, yielding formation of LaMgNi4 slabs with statistic and equal occupation of one site by La and Mg atoms. Mg alters structural features of the hydrogenation process. Instead of a strong unilateral anisotropic expansion which takes place on hydrogenation of La2Ni7, the unit cell of La1.5Mg0.5Ni7D9.1 is formed by nearly equal hydrogen-induced expansions proceeding in the basal plane (Delta a/a = 7.37%) and along [001] (Delta c/c = 9.67%). In contrast with La2Ni7D6.5 where only LaNi2 layers absorb hydrogen atoms, in La1.5Mg0.5Ni7D9.1 both LaNi5 and LaMgNi4 layers become occupied. Nine types of sites were found to be filled by D in total, including tetrahedral (La,Mg)(2)Ni-2, (La,Mg)Ni-3, Ni-4, tetragonal pyramidal La2Ni3 and trigonal bipyramidal (La,Mg)(3)Ni-2 interstices. The hydrogen sublattice around the La/Mg site shows formation of two co-ordination spheres of D atoms: an octahedron MgD6 and a 16-vertex polyhedron LaD16 around La. The interatomic distances are in the following ranges: La-D (2.28-2.71), Mg-D (2.02-2.08), Ni-D (1.48-1.86 angstrom). All D-D distances exceed 1.9 angstrom. Thermodynamic PCT studies yielded the following values for the Delta H and Delta S of hydrogenation/decomposition; Delta H-H = -15.7 +/- 0.9 kJ (mol(H))(-1) and Delta S-H = -46.0 +/- 3.7 J (K mol(H))(-1) for H-2 absorption, and Delta H-H = 16.8 +/- 0.4 kJ (mol(H))(-1) and Delta S-H = 48.1 +/- 1.5 J (K mol(H))(-1) for H-2 desorption.

  • 36. Denys, R. V.
    et al.
    Riabov, B.
    Yartys, V. A.
    Delaplane, Robert
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Sato, M.
    Hydrogen storage properties and structure of La1-xMgx(Ni1-yMny)(3) intermetallics and their hydrides2007In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 446, p. 166-172Article in journal (Refereed)
    Abstract [en]

    'Hybrid' RNi3 (R =rare earth metal) crystal structures are built of the slabs of simpler types, CaCu5 and MgZn2. Different affinities of these slabs to hydrogen result in unusual "anisotropic" expansion of the RNi3 and R2Ni7 (R = La, Cc) structures upon hydrogenation. This work focuses on studies of the hydrogenation behaviour of LaNi3 and on the properties of the hydrides of the modified by Mg and Mn La-Ni alloys. The crystal structure of LaNi3D2.8 and the crystal structure and hydrogen storage behaviours of the La1.5Mg0.5Ni7 and La(Ni-1-,Mn,)3 (x=0; 0.067-, 0.133; 0.2: 0.267; 0.3; 0.333; 0.4) alloys were in focus. The deuteration of LaNi3 with PuNi3 type of structure leads to the formation of LaNi3D2.8 and is accompanied by a deformation of the metal matrix causing a change of the initial rhombohedral symmetry (space group R3m) to a nionoclinic one (space group C2/m; a = 8.6408(7) angstrom, b=4.928](4) angstrom, c= 32.774(3) A; = 90.850(8)degrees; V= 1395.5(2) angstrom(3)). Similar to the earlier studied CeNi3D2.8, preferential occupation by deuterium atoms of the AB, layers takes place, leading to the "anisotropic" expansion of the unit cell along [0 0 1] (Delta c/c = 30.6%). 14 occupied D crystallographic sites have 4 chemically different types of metal-atom surroundings, including Ni-4 (2), La2Ni2 (2), La3Ni (6), and La3Ni3 (4). Modification of the La-Ni alloys by magnesium and manganese leads to the formation of intermetallic compounds crystallising with the PuNi3, CeNi3, and Ce2Ni7-type structures. An ordered substitution of La by Mg in the MgZn2-type slabs was observed, causing a complete alteration of the hydrogenation behaviour of the original LaNi3 alloy. La1.5Mg0.5Ni7D9 isotropically expands upon its formation and leads to a substantial increase of the stability against hydrogenation-induced aniorphisation. On the other hand, replacement of Ni by Mn leads to the change in crystal-structure type from PuNi3 to CeNi3 in the LaNi3-xMn. alloys (x>0.1). An ordered substitution of Ni by Mn proceeds inside the RNi5 slabs only. This decreases the stability of the initial alloy against amorphisation on hydrogenation.

  • 37. Denys, R. V.
    et al.
    Yartys, V. A.
    Sato, Masashi
    Riabov, A. B.
    Delaplane, R. G.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Crystal chemistry and thermodynamic properties of anisotropic Ce2Ni7H4.7 hydride2007In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 180, no 9, p. 2566-2576Article in journal (Refereed)
    Abstract [en]

    A new intermetallic deuteride Ce2Ni7D4.7 with an anomalous volume expansion has been studied. Its structure was solved on the basis of in situ neutron diffraction data. Expansion proceeds along the c-axis and within the CeNi2 slabs only. All D atoms are located inside these slabs and on the border between CeNi2 and CeNi5. Ordering of D atoms in the bulk of CeNi2 is accompanied by substantial deformation of these slabs thus lowering the hexagonal symmetry to orthorhombic [space group Pmcn (No. 62); a = 4.9251(3) angstrom b = 8.4933(4) angstrom, c = 29.773(1) angstrom]. Inside the CeNi2 layer the hydrogen sublattice is completely ordered; all D-D distances exceed 2.0 angstrom Local coordination of Ni by D inside the CeNi, blocks is of "open", saddle-like type. Hydrogen ordering is mainly determined by Ce-H and H-H interactions. The press ure-composition-temperature measurements yielded the following thermodynamic parameters of the formation of the hydride: Delta H = -22.4 kJ/MOl(H), Delta S = -59.9 J/(K mol(H)).

  • 38.
    Ebbsjo, I
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Kalia, RK
    Nakano, A
    Rino, JP
    Vashishta, P
    Topology of amorphous gallium arsenide on intermediate length scales: A molecular dynamics study2000In: JOURNAL OF APPLIED PHYSICS, ISSN 0021-8979, Vol. 87, no 11, p. 7708-7711Article in journal (Refereed)
    Abstract [en]

    Structural correlations in amorphous gallium arsenide are investigated with molecular-dynamics simulations using a new interatomic potential function. The calculated static structure factor, in particular the height and width of the first peak which is a

  • 39.
    Edström, Kristina
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Ito, S
    Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Delaplane, RG
    Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    The crystal and magnetic structure of nonstoichiometric K+ beta-ferrite2000In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, ISSN 0304-8853, Vol. 212, no 3, p. 347-354Article in journal (Refereed)
    Abstract [en]

    The crystal and magnetic structure of K+ beta-ferrite, K1.33Fe12O17, has been studied with neutron powder diffraction (lambda = 1.47) at 10, 295 and 923 K. Parameters describing the crystal and magnetic structure were refined with the Rietveld method. A m

  • 40.
    Edström, Kristina
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Ito, S
    Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Delaplane, RG
    Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    The magnetic structure in K+ beta-ferrite2000In: PHYSICA B, ISSN 0921-4526, Vol. 276, p. 746-747Article in journal (Refereed)
    Abstract [en]

    The magnetic structures of stoichiometric, KFe11O17, and non-stoichiometric, K1.33Fe11O17, K+ beta-ferrite, have been studied with neutron powder diffraction at 10, 295 and 923 K. Parameters describing the crystal and magnetic structures were refined with

  • 41.
    Engberg, D.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    The new thermal time of flight spectrometer at NFL2002In: Appl. Phys, Vol. A 74, p. 226-Article in journal (Refereed)
  • 42.
    Ericsson, T., Larsson, C. and Peng, R. L.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Studies of residual stress, microcracks, hardness and microstructure of cold compacted metallic green bodies2002In: Proc. of The Material Research Society Meeting (MRS) 2002., 2002Conference paper (Other scientific)
  • 43.
    Ericsson, T., C. Larsson and R. L. Peng
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Studies of residual stress, microcracks, hardness and microstructure of cold compacted metallic green bodies2003In: Materials Research Society (MRS) Symposium Proceedings, 2003, Vol. 759, p. 53-64Conference paper (Other scientific)
  • 44.
    Eriksson, S.- G., Walkeapää, M. V., Ivanov, S. Eriksen, J. Rundlöf, Håkan Mathieu, R. and Svedlindh, P.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Phase transitions and magnetic order in La1-xSrxMnO3-d(xŠ0.3; 2.85Š3-dŠ 3.00)2002In: Ferroelectrics, Vol. 269, p. 309-Article in journal (Refereed)
  • 45.
    Eriksson, S-G
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, S
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    McGreevy, R
    Berastegui, P
    Björnsson, P
    Rubhaussen, M
    Bäckström, J
    Käll, M
    Börjesson, L
    A neutron powder diffraction and inelastic light scattering study of (La,Sr)MnO32001In: Materials Science Forum, Vol. 378-381, p. 505-Article in journal (Refereed)
  • 46.
    Eriksson, SG
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Valkeapää, M
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Ivanov, S
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Eriksen, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Rundlöf, Håkan
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry. strukturkemi.
    Johansson, L-G
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Mathieu, R
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Svedlindh, P
    Technology, Department of Materials Science. Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Bäckström, J
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Börjesson, L
    Teknisk-naturvetenskapliga vetenskapsområdet, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Phase transitions and magnetic order in La1-xSrxMnO3-d(x<0.3; 2.85<3-d<3.00)2002In: Ferroelectrics, Vol. 269, p. 309-314Article in journal (Refereed)
  • 47.
    Frantti, J., Ivanov, S. A., Eriksson, S.- G., Rundlöf, H., Lantto,V.Lappalainen, J. and Kakihana, M.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    On the phase transitions of Pb(ZrxTi12002In: Phys. Rev., Vol. B66, p. 64108-Article in journal (Refereed)
  • 48.
    Frantti, J., Ivanov, S., Eriksson, S., Rundlöf, H., Lantto, V., Lappalainen, J. and Kakihana, M.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Phase transitions of Pb(ZrxTi12002In: Phys. Rev., Vol. B66, p. 64108-Article in journal (Refereed)
  • 49.
    Frantti, J., Ivanov, S., Eriksson, S.- G., Lappalainen, J., Lantto, V. and Kakihana, M.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Neutron Diffraction and Bond-valence Calulation studies of Pb(ZrxTi12002In: Ferroelectrics, Vol. 272, p. 51-Article in journal (Refereed)
  • 50.
    Frantti, J
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Ivanov, S
    Eriksson, S-G
    Lappalainen, J
    Lantto, V
    Kakihana, M
    Neutron diffraction and Raman scattering studies of Pb(ZrxTi1-x)O3 ceramics2001Other (Other scientific)
1234 1 - 50 of 166
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