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  • 1.
    Boström, T
    et al.
    Norut Northern Research Institute Narvik, Norge.
    Valizadeh, Sima
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Lu, J
    Division of Thin Film Physics, Department of Physics, Chemistry and Biology - IFM, Linköping University, Linköping.
    Jensen, J
    Division of Thin Film Physics, Department of Physics, Chemistry and Biology - IFM, Linköping University, Linköping.
    Westin, Gunnar
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Inorganic Chemistry.
    Wäckelgård, Ewa
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Structure and morphology of nickel-alumina/silica solar thermal selective absorbers2011In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 357, no 5, p. 1370-1375Article in journal (Refereed)
    Abstract [en]

    Nickel-alumina/silica thin film materials for the use in solar thermal absorbers have been investigated using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Elastic Recoil Detection Analysis (ERDA). The TEM images revealed that all layers have a very small thickness variation and that the layers are completely homogenous. High resolution images showed 5-10 nm (poly) crystalline nickel nano-particles. ERDA showed that both the silica and alumina compositions contain more oxygen than 2:1 and 3:2 respectively. SEM showed the surface morphology and characteristics of the top silica anti-reflection layer. Hybrid-silica has showed to generate a smoother surface with less cracking compared to pure silica. The final curing temperature revealed to be of importance for the formation of cracks and the surface morphology.

  • 2.
    Brohede, Ulrika
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Strømme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Percolation phenomena in controlled drug release matrices studied by dielectric spectroscopy and the alternating ionic current method2007In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 353, no 47-51, p. 4506-4514Article in journal (Refereed)
    Abstract [en]

    The combined radial and axial ionic drug release from – as well as the percolating ionic conductivity in – cylindrical tablets was investigated by the alternating ionic current (AIC) method and dielectric spectroscopy (DS), respectively. The binary tablets consisted of mixtures of insulating ethyl cellulose and the poor ionic conductor model drug NaCl at nine different concentrations. We found that the dc conductivity, extracted from DS in a well-defined range of frequencies by a power-law method, could be described by a NaCl volume fraction percolation threshold of 0.06 in a 3D conducting network. The low threshold was explained by water-layer-assisted ion conduction in μm-sized ethyl cellulose channels between NaCl grains as probed by Hg porosimetry and SEM. The drug release process, as probed by AIC, could be described by a matrix porosity percolation threshold of 0.22, equivalent to a NaCl volume fraction of 0.13. The higher percolation threshold found in the drug release experiments as compared to the DS recordings could be explained by the different probing mechanisms of the analysis methods. The present study should provide valuable knowledge for the analysis of a broad class of ion conducting systems for which the frequency response of the dc ion conductivity is superimposed on other dielectric processes in the dielectric spectrum. It also brings forward knowledge important for the development of controlled drug-delivery vehicles as the presented findings show that the drug release from matrix tablets with unsealed tablet walls substantially differs from earlier investigated release processes for which the drug has only been allowed to escape through one of the flat tablet surfaces.

  • 3. Duenas, S.
    et al.
    Castan, H.
    Garcia, H.
    Bailon, L.
    Kukli, K.
    Lu, Jun
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
    Ritala, M.
    Leskelae, M.
    Selection of post-growth treatment parameters for atomic layer deposition of structurally disordered TiO2 thin films2008In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 354, no 2-9, p. 404-408Article in journal (Refereed)
    Abstract [en]

    Routes to atomic layer-deposited TiO2 films With decreased leakage have been studied by using electrical characterization techniques. The combination of post-deposition annealing parameters, time and temperature, which provides measurable aluminum-titanium oxide-silicon structures - i.e., having capacitance-voltage curves which show accumulation behavior - are 625 degrees C, 10 min for p-type substrates, and 550 degrees C, 10 min for n-type substrates. The best annealing conditions for p-type substrates are 625 degrees C with the length extended to 30 min, which produces an interfacial state density of about 5-6 x 10(11) cm(-2) eV(-1), and disordered-induced gap state density below our experimental limits. We have also proved that a post-deposition annealing must be applied to TiO2/HfO2 and HfO2/TiO2/HfO2 stacked structures to obtain adequate measurability conditions.

  • 4.
    Es-Soufi, H.
    et al.
    Univ Moulay Ismail, Equipe Physicochim Mat Condensee, PCMC, Fac Sci Meknes, Meknes, Morocco..
    Bih, L.
    Univ Moulay Ismail, Equipe Physicochim Mat Condensee, PCMC, Fac Sci Meknes, Meknes, Morocco..
    Manoun, B.
    Univ Hassan 1Er, Lab Sci Mat Mat & Modelisat LS3M, Settat 26000, Morocco.;Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept MSN, Lot 660 Hay Moulay Rachid, Ben Guerir 43150, Morocco..
    Lazor, P.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
    Structure, thermal analysis and optical properties of lithium tungsten-titanophosphate glasses2017In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 463, p. 12-18Article in journal (Refereed)
    Abstract [en]

    A melt-quenching method is used to prepare homogeneous glasses inside the 20Li(2)O-(50-x)Li2WO4-xTiO(2)-30P(2)O(5) (x = 0, 5, 8,10 and 15 mol%) system. The amorphous and glassy states of the glasses are evidenced by the X-ray diffraction and differential scanning calorimetry (DSC) analysis, respectively. The glasses were found to be colorless. The determined parameters for the glasses such as density, molar volume and glass transition temperature (T-g) depend strongly on the chemical composition of the glasses. The density and T-g are found to decrease and increase with TiO2 content, respectively. Infrared (IR) spectroscopy is used to characterize their structural approach. This technique has allowed the identification of different phosphate structural units mainly pyrophosphate and metaphosphate in their structure. From the absorption edge studies, the values of the optical band gap, E-g, and Lirbach energy, Delta E, were evaluated. The optical band gap is found to depend on the glass composition and it decreases as the content of the TiO2 increases. (C) 2017 Elsevier B.V. All rights reserved.

  • 5. Furlani, Maurizio
    et al.
    Stappen, Christopher
    Mellander, Bengt-Erik
    Niklasson, Gunnar A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Concentration dependence of ionic relaxation in lithium doped polymer electrolytes2010In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 356, no 11-17, p. 710-714Article in journal (Refereed)
    Abstract [en]

    A detailed impedance spectroscopy study at ambient temperature was carried out on polymer electrolytes based on low molecular weight poly(ethylene oxide) 400, poly(propylene oxide) 400 and a random copolymer of molecular weight 600, to which were added LiN(CF3SO2)(2) (LiTFSI) salt. The ionic conductivity exhibits a maximum at intermediate salt concentrations and is significantly higher for poly(ethylene oxide) and the copolymer. A dielectric relaxation was found in a frequency region above the one, where the ion conductivity dominates the dielectric response, and below the region of the relaxations of the polymer host. The relaxation strength scales with ion concentration, as appropriate for an ion pair relaxation in systems above the glass transition. The frequency of this relaxation, multiplied by the relaxation strength, has been found to be proportional to the ion conductivity, and the relaxation has therefore been assigned to short-range ionic motion in the polymer. It exhibits characteristics similar to conductivity relaxations in inorganic solid ion conductors, and is considered to be due to the same species that give rise to the ion conductivity.

  • 6.
    Granqvist, Claes-Göran
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Azens, A
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Isidorsson, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Kharrazi, M
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Kullman, Lisen
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Lindström, T
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Niklasson, Gunnar A.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Ribbing, Carl-Gustaf
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Rönnow, D
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Strömme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Veszelei, M
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science.
    Towards the smart window: progress in electrochromics1997In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 218, p. 273-279Article in journal (Refereed)
    Abstract [en]

    Electrochromic devices have the ability to produce reversible and persistent changes of their optical properties. The phenomenon is associated with joint ion and electron transport into/out of an electrochromic thin film, in most cases being a transition metal oxide. This paper outlines the various applications of such devices in smart windows suitable for energy-conscious architecture, in variable-reflectance mirrors, and in display devices. Critical materials issues and design concepts are discussed. The paper also covers two specific research topics: computed electronic structure of crystalline WO3 incorporating ionic species, showing how reflectance modulation emerges from a first-principles calculation; and Li+ dynamics in heavily disordered Ti oxide, illustrating how diffusion constants derived from impedance spectroscopy can be reconciled with the Anderson—Stuart model.

  • 7. Kaban, I.
    et al.
    Gruner, S.
    Hoyer, W.
    Jovari, P.
    Delaplane, Robert G.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Wannberg, A.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Experimental and RMC simulation study of liquid Cu6Sn52007In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 353, no 32-40, p. 3027-3031Article in journal (Refereed)
    Abstract [en]

    The atomic structure of liquid Cu6Sn5 alloy at 640 degrees C has been investigated with neutron and X-ray diffraction. The experimental structure factors were used to perform computer modeling with the reverse Monte Carlo method. Three different series of simulations were carried out. It has been established that the partial structure factors modeled by combining the experimental data of the two independent measurements (XRD and ND) are reliable, while those modeled with only one set of the experimental data (XRD or ND) exhibit some non-physical features.

  • 8.
    Niklasson, Gunnar A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Malmgren, Sara
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
    Green, Sara
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Backholm, Jonas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Determination of electronic structure by impedance spectroscopy2010In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 356, no 11-17, p. 705-709Article in journal (Refereed)
    Abstract [en]

    We present a novel method, based on electrochemical intercalation and impedance spectroscopy, to determine the electronic density of states of disordered transition metal oxides. Specifically, we have determined the "electrochemical density of states" of tungsten and iridium oxide thin films over energy ranges as wide as 1-2 eV. Our experimental results show a number of qualitative features exhibited by state-of-the-art band structure computations. Differences in details are probably due to the disordered, porous and sometimes amorphous nature of our films. The results suggest that the impedance spectroscopy method can be used to obtain the density of states only if the conduction band states are localized. The electrochemical density of states is often smaller than the computed one due to kinetic effects, i.e. very slow relaxations of the charge carriers. Nevertheless, our sensitive method opens new vistas for studying the electronic structure of disordered materials.

  • 9.
    Niklasson, Gunnar A
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Norling, AnnaKarin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Berggren, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Charge transport between localized states in lithium-intercalated amorphous tungsten oxide2007In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 353, no 47-51, p. 4376-4379Article in journal (Refereed)
    Abstract [en]

    We report on electron transport in amorphous tungsten oxide films, prepared by dc magnetron sputtering and subsequently electrochemically intercalated with lithium. The ion–electron intercalation process allows us to change the position of the Fermi level in a controlled way and to determine the density-of-states in the conduction band. We present a new method to determine the localization length of the electron states in disordered materials. The method is based on measurements of the electronic density-of-states together with electrical resistance in the variable range hopping regime. We find that the electronic states of amorphous tungsten oxide are localized up to about 1.3 eV into the conduction band, where an insulator-metal transition occurs. The localization length was determined on the insulating side of the transition and the estimated scaling exponent is consistent with the scaling theory of localization.

  • 10.
    Sanz, R.
    et al.
    Instituto de Ciencia de Materiales de Madrid.
    Jaafar, M.
    Instituto de Ciencia de Materiales de Madrid.
    Rosa, W.O.
    Instituto de Ciencia de Materiales de Madrid.
    Badini-Confalonieri, G.
    Instituto de Ciencia de Materiales de Madrid.
    Jensen, Jens
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics.
    Hernandez-Vélez, M.
    Instituto de Ciencia de Materiales de Madrid.
    Vázquez, M.
    Instituto de Ciencia de Materiales de Madrid.
    Effects on the structural and magnetic properties of amorphous ribbons of (Co0.94Fe0.06)(72.5)Si12.5B15 caused by 4 MeV Cl2+ ion irradiation2007In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 353, no 8-10, p. 879-882Article in journal (Refereed)
    Abstract [en]

    The use of energetic ion irradiation to modify magnetic materials has attracted increasing interest in recent years. The possibility of patterning surfaces on these materials offers a wide range of potential applications particularly in technologies related to magnetic storage media, sensing devices and electromagnetic shielding materials. In this work, ultrasoft non-magnetostrictive (Co0.94Fe0.06)72.5Si12.5B15 amorphous ribbons, 50 μm thick and 0.85 mm wide, fabricated by the chilly block melt spinning technique are irradiated, in their amorphous state, by 4 MeV Cl2+ ions with a fluence of 5 × 1013 cm-2. The hysteresis properties of both irradiated and non-irradiated samples are characterized by means of a vibrating sample magnetometer while surface magnetic domain structure is observed by Bitter technique. The presence of an induced magnetic anisotropy in irradiated samples is ascribed to the local damage, caused by ion irradiation treatment, which results in modified coercive field and permeability of the samples. X-ray diffraction results are presented to confirm the amorphicity of the structure even after irradiation with ions.

  • 11. Sinouh, H.
    et al.
    Bih, L
    El Bouari, A.
    Azrour, M.
    Manoun, B.
    Lazor, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
    BaO effect on the thermal properties of the phosphate glasses inside the Na2O – SrO – TiO2 – B2O3 - P2O5 system2014In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 405, p. 33-38Article in journal (Refereed)
    Abstract [en]

    The glasses in the Na2O-SrO-BaO-TiO2-B2O3-P2O5 system were prepared by the conventional quenching route. In the present work, we studied the effect of Ba-Sr substitution on some physical parameters such as density, molar volume, micro-hardness, glass transition temperature (T-g), and crystallization temperature (T-c) of series of glasses with the following composition 33.33Na(2)O-(10 - x)SrO - xBaO-10TiO(2)-30B(2)O(3)-16.67P(2)O(5). The crystallization of the glasses by heat-treatments is performed and X-ray diffraction (XRD) showed the formation of a ferroelectric phase SrTiO3 and Na4Ba2(PO3)(6) in their network. The kinetic of the crystallization is carried out by using DSC technique, and the activation energy and the Avrami parameter (n) are determined.

  • 12.
    Ukleev, V.
    et al.
    BP Konstantinov Petersburg Nucl Phys Inst, Natl Res Ctr, Kurchatov Inst, Gatchina 188300, Russia.;Russian Acad Sci, St Petersburg Acad Univ Nanotechnol Res & Educ, St Petersburg 194021, Russia..
    Dyadkina, E.
    BP Konstantinov Petersburg Nucl Phys Inst, Natl Res Ctr, Kurchatov Inst, Gatchina 188300, Russia..
    Vorobiev, Alexey
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
    Gerashchenko, O. V.
    BP Konstantinov Petersburg Nucl Phys Inst, Natl Res Ctr, Kurchatov Inst, Gatchina 188300, Russia..
    Caron, L.
    Delft Univ Technol, NL-2628 CN Delft, Netherlands.;Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany..
    Sitnikov, A. V.
    Voronezh State Tech Univ, Voronezh 394026, Russia..
    Kalinin, Yu. E.
    Voronezh State Tech Univ, Voronezh 394026, Russia..
    Grigoriev, S. V.
    BP Konstantinov Petersburg Nucl Phys Inst, Natl Res Ctr, Kurchatov Inst, Gatchina 188300, Russia.;St Petersburg State Univ, St Petersburg 198904, Russia..
    Morphology and magnetic properties of nanocomposite magnetic multilayers [(Co(4)oFe(40)B(2)O)(34)(SiO2)(66)]/[C](47)2016In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 432, p. 499-504Article in journal (Refereed)
    Abstract [en]

    We report on the investigation of morphology, magnetic and conductive properties of the mutilayered nanostructures [(Co40Fe40B20)(34)(SiO2)(66)]/[C](47) consisting of the contacting magnetic (Co Fe-40 (40) B (20)) (34)(SiO2)(66) nanocomposite and amorphous semiconductor carbon C layers. It is shown by Grazing-Incidence Small-Angle X-ray Scattering method that the ordering and the size of nanoparticles in the magnetic layers do not change profoundly with increasing of carbon layer thickness. Meanwhile, the electrical conductance and the magnetic properties are significantly varied: resistance of the samples changes by four orders of magnitude and superparamagnetic blocking temperature changes from 15 K to 7 K with the increment of carbon layer thickness h(c) from 0.4 nm to 1.8 nm. We assume that the formation of the homogeneous semiconductor interlayer leads to modification of the metal-insulator growth process that drives the changes in the magnetic and conductive properties.

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