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Andersson, Yvonne
Publications (10 of 38) Show all publications
Ottosson, M., Boman, M., Berastegui, P., Andersson, Y., Hahlin, M., Korvela, M. & Berger, R. (2018). Response to the comments by P. Szakalos, T. angstrom kermark and C. Leygraf on the paper "Copper in ultrapure water, a scientific issue under debate" [Letter to the editor]. Corrosion Science, 142, 308-311
Open this publication in new window or tab >>Response to the comments by P. Szakalos, T. angstrom kermark and C. Leygraf on the paper "Copper in ultrapure water, a scientific issue under debate"
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2018 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 142, p. 308-311Article in journal, Letter (Other academic) Published
Keywords
Copper, XPS, AES, Oxidation
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:uu:diva-366387 (URN)10.1016/j.corsci.2018.02.003 (DOI)000444933400030 ()
Available from: 2018-11-21 Created: 2018-11-21 Last updated: 2018-11-21Bibliographically approved
Ottosson, M., Boman, M., Berastegui, P., Andersson, Y., Hedlund, M., Korvela, M. & Berger, R. (2017). Copper in ultrapure water, a scientific issue under debate. Corrosion Science, 122, 53-60
Open this publication in new window or tab >>Copper in ultrapure water, a scientific issue under debate
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2017 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 122, p. 53-60Article in journal (Refereed) Published
Abstract [en]

The corrosion properties of copper in ultrapure water have been studied experimentally by submerging copper samples (99.9999%) in pure water for up to 29 months. The surface was first electropolished at ambient temperature, then exposed to hydrogen gas treatment at 300-400 degrees C, thereby reducing the bulk hydrogen content to 0.03 ppm. These copper samples, the water and the glassware were all then subjected to precise chemical analysis. Great care was taken to avoid contamination. After exposure, only similar to 6 mu g/L copper had accumulated in the water phase. Electron spectroscopy could not detect Cu2O or any other oxidation products containing copper.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2017
Keywords
Copper, XPS, AES, Oxidation
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-330714 (URN)10.1016/j.corsci.2017.03.014 (DOI)000404490600006 ()
Available from: 2017-10-09 Created: 2017-10-09 Last updated: 2017-12-28Bibliographically approved
Cedervall, J., Beran, P., Vennström, M., Danielsson, T., Ronneteg, S., Höglin, V., . . . Sahlberg, M. (2016). Low temperature magneto-structural transitions in Mn3Ni20P6. Journal of Solid State Chemistry, 237, 343-348
Open this publication in new window or tab >>Low temperature magneto-structural transitions in Mn3Ni20P6
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2016 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 237, p. 343-348Article in journal (Refereed) Published
Abstract [en]

Abstract X-ray and neutron powder diffraction has been used to determine the crystal and magnetic structure of Mn3Ni20P6. The crystal structure can be described as cubic with space group Fm 3 ¯ m (225) without any nuclear phase transformation within studied temperature interval from room temperature down to 4 K. The magnetic structure of Mn3Ni20P6 is complex with two independent magnetic positions for the Mn atoms and the compound passes three successive magnetic phase transitions during cooling. At 30 K the spins of the Mn atoms on the Wyckoff 4a site (Mn1) order to form a primitive cubic antiferromagnetic structure with propagation vector k=(0 0 1). Between 29 and 26 K the Mn atoms on the Wyckoff 8c site (Mn2) order independently on already ordered Mn1 magnetic structure forming a commensurate antiferromagnetic structure with propagation vector k=(0 0 ½) and below 26 K, both Mn positions order to form an incommensurate helical structure with propagation vector k=(0 0 ~0.45). Magnetization vs. temperature curve of Mn3Ni20P6 shows a steep increase indicating some magnetic ordering below 230 K and a sharp field dependent anomaly in a narrow temperature range around 30 K.

Keywords
Mn-compounds, Magnetic structure, Antiferromagnetism, Neutron diffraction
National Category
Chemical Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-293989 (URN)10.1016/j.jssc.2016.02.028 (DOI)000373661100047 ()
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Available from: 2016-05-15 Created: 2016-05-15 Last updated: 2017-11-30Bibliographically approved
Höglin, V., Hudl, M., Caron, L., Beran, P., Sørby, M. H., Nordblad, P., . . . Sahlberg, M. (2015). Detailed study of the magnetic ordering in FeMnP0.75Si0.25. Journal of Solid State Chemistry, 221, 240-246
Open this publication in new window or tab >>Detailed study of the magnetic ordering in FeMnP0.75Si0.25
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2015 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 221, p. 240-246Article in journal (Refereed) Published
Abstract [en]

Magnetic and crystallographic properties of FeMnP0.75Si0.25 in the hexagonal Fe2P-type structure have been investigated by X-ray powder diffraction, neutron powder diffraction and magnetic measurements. The room temperature diffractograms reveal co-existence of two distinct structural phases in the samples with small, but significant, differences only in the unit cell dimensions. The volume ratio between the two phases is governed by the annealing conditions. One of the phases orders ferromagnetically (TC = 250 K) and the other in an incommensurate antiferromagnetic structure at low temperatures (qx = 0.363(1), TN = 150 K).

Keywords
Magnetic structure, Incommensurate ordering, Neutron powder diffraction, X-ray powder diffraction (XRD), Magnetization
National Category
Inorganic Chemistry Engineering and Technology
Research subject
Chemistry with specialization in Inorganic Chemistry; Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-234509 (URN)10.1016/j.jssc.2014.10.013 (DOI)000347263700034 ()
Available from: 2014-10-20 Created: 2014-10-20 Last updated: 2017-12-05Bibliographically approved
Höglin, V., Cedervall, J., Andersson, M. S., Sarkar, T., Hudl, M., Nordblad, P., . . . Sahlberg, M. (2015). Phase diagram, structures and magnetism of the FeMnP1-xSix-system. RSC Advances, 5(11), 8278-8284
Open this publication in new window or tab >>Phase diagram, structures and magnetism of the FeMnP1-xSix-system
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2015 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 11, p. 8278-8284Article in journal (Refereed) Published
Abstract [en]

The magnetic properties of the (Fe,Mn)2(P,Si)-system have been shown to be readily manipulated by small changes in composition. This study surveys the FeMnP1−xSix-system (0.00 ≤ x ≤ 1.00) reporting sample syntheses and investigations of crystallographic and magnetic properties using X-ray powder diffraction and magnetic measurements. Two single phase regions exist: the orthorhombic Co2P-type structure (x < 0.15) and the Fe2P-type structure (0.24 ≤ x < 0.50). Certain compositions have potential for use in magnetocaloric applications.

National Category
Inorganic Chemistry Engineering and Technology
Research subject
Chemistry with specialization in Inorganic Chemistry; Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-234515 (URN)10.1039/C4RA15419C (DOI)000347720900065 ()
Available from: 2014-10-22 Created: 2014-10-20 Last updated: 2017-12-05Bibliographically approved
Boman, M., Berger, R., Andersson, Y., Hahlin, M., Björefors, F., Gustafsson, T. & Ottosson, M. (2014). Corrosion of copper in water free from molecular oxygen. Corrosion Engineering, Science and Technology, 49(6), 431-434
Open this publication in new window or tab >>Corrosion of copper in water free from molecular oxygen
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2014 (English)In: Corrosion Engineering, Science and Technology, ISSN 1478-422X, E-ISSN 1743-2782, Vol. 49, no 6, p. 431-434Article in journal (Refereed) Published
Abstract [en]

The possibility of copper reacting with O-2-free water has been investigated by analysis of primary corrosion products, as well as by monitoring gas pressure change by time, in long term experiments for up to 6 months in a glove box environment. We establish hydrogen production, but being of the same magnitude irrespective whether copper is present or not. Although low, the hydrogen production rate is considerably larger than what would directly correspond to the amount of analysed copper oxidation products. Our analyses encompass the changes to the surface cleaned copper (99.9999%), the water phase and the Duran glass in contact with the water (ppt quality). We have used very sensitive methods (XPS, AES, ICP-MS, XRF) while keeping contamination risks to a minimum. We conclude that the oxidation rate of copper is very low, yielding only parts of a monolayer of Cu2O after 6 months of exposure at 50 degrees C together with an accompanying very low concentration of copper species (4-5 mu g L-1) in the water phase.

Keywords
Copper corrosion, Pure water, Nuclear waste canister
National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-241537 (URN)10.1179/1743278214Y.0000000199 (DOI)000346129000007 ()
Available from: 2015-01-13 Created: 2015-01-13 Last updated: 2017-12-05Bibliographically approved
Caron, L., Hudl, M., Höglin, V., Dung, N. H., Gómez, C. P., Sahlberg, M., . . . Nordblad, P. (2013). Magnetocrystalline anisotropy and the magnetocaloric effect in Fe2P. Physical Review B. Condensed Matter and Materials Physics, 88(9), 094440
Open this publication in new window or tab >>Magnetocrystalline anisotropy and the magnetocaloric effect in Fe2P
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2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 88, no 9, p. 094440-Article in journal (Refereed) Published
Abstract [en]

Magnetic and magnetocaloric properties of high-purity, giant magnetocaloric polycrystalline and single-crystalline Fe2P are investigated. Fe2P displays a moderate magnetic entropy change, which spans over 70 K and the presence of strong magnetization anisotropy proves this system is not fully itinerant but displays a mix of itinerant and localized magnetism. The properties of pure Fe2P are compared to those of giant magnetocaloric (Fe,Mn)2(P,A) (where A = As, Ge, Si) compounds helping understand the exceptional characteristics shown by the latter, which are so promising for heat pump and energy conversion applications.

National Category
Natural Sciences Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-210234 (URN)10.1103/PhysRevB.88.094440 (DOI)000325172900003 ()
Available from: 2013-11-05 Created: 2013-11-04 Last updated: 2017-12-06
Kadas, K., Teles da Costa, M., Vitos, L., Andersson, Y., Bergman, A. & Eriksson, O. (2012). On the icosahedral metal-phosphorus coordination in melliniite: a gift from the sky for materials chemistry. Journal of Materials Chemistry, 22(29), 14741-14745
Open this publication in new window or tab >>On the icosahedral metal-phosphorus coordination in melliniite: a gift from the sky for materials chemistry
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2012 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 22, no 29, p. 14741-14745Article in journal (Refereed) Published
Abstract [en]

Recently a new mineral, melliniite, was reported from a meteorite sample. This mineral has an ideal chemical composition of (Ni,Fe)(4)P and a crystal structure where the phosphorus atoms are coordinated by twelve nearest neighboring metal atoms. No other phosphide has been reported to have such high metal coordination. Therefore melliniite provides new and important information about the chemical interaction in transition metal chalcogenides and possibly pnictides. We demonstrate here, using first principles theory, that the stability and icosahedral metal-phosphorous coordination of melliniite are due to a balance between covalent Fe-P binding, configurational entropy and a weaker nickel-phosphorus binding, that has only a weak directional dependence.

National Category
Materials Chemistry Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-177879 (URN)10.1039/c2jm32311g (DOI)000305966200059 ()
Available from: 2012-07-19 Created: 2012-07-19 Last updated: 2017-12-07Bibliographically approved
Sahlberg, M., Zlotea, C., Latroche, M. & Andersson, Y. (2011). Fully reversible hydrogen absorption and desorption reactions with Sc(Al1-xMgx), x=0.0, 0.15, 0.20. Journal of Solid State Chemistry, 184(1), 104-108
Open this publication in new window or tab >>Fully reversible hydrogen absorption and desorption reactions with Sc(Al1-xMgx), x=0.0, 0.15, 0.20
2011 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 184, no 1, p. 104-108Article in journal (Refereed) Published
Abstract [en]

The hydrogen storage properties of Sc(Al1−xMgx), x=0.0, 0.15, 0.20, have been studied by X-ray powder diffraction, thermal desorption spectroscopy, pressure-composition-isotherms and scanning electron microscopy techniques. Hydrogen is absorbed from the gas phase at 70 kPa and 400 °C under the formation of ScH2 and aluminium with magnesium in solid solution. The reaction is fully reversible in vacuum at 500 °C and shows the hydrogenation–disproportionation–desorption-recombination (HDDR) behaviour. The activation energy of desorption was determined by the Kissinger method to 185 kJ/mol. The material is stable up to at least six absorption–desorption cycles and there is no change in particle size during cycling.

Keywords
Scandium intermetallics, Hydrides, Hydrogen storage materials, X-ray diffraction
National Category
Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-107388 (URN)10.1016/j.jssc.2010.10.034 (DOI)000286774600015 ()
Available from: 2009-08-11 Created: 2009-08-10 Last updated: 2017-12-13Bibliographically approved
Hudl, M., Häggström, L., Delczeg-Czirjak, E.-K., Höglin, V., Sahlberg, M., Vitos, L., . . . Andersson, Y. (2011). Strongly enhanced magnetic moments in ferromagnetic FeMnP0.5Si0.5. Applied Physics Letters, 99(15), 152502
Open this publication in new window or tab >>Strongly enhanced magnetic moments in ferromagnetic FeMnP0.5Si0.5
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2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 99, no 15, p. 152502-Article in journal (Refereed) Published
Abstract [en]

The compound FeMnP(0.5)Si(0.5) has been studied by magnetic measurements, Mossbauer spectroscopy, and electronic structure and total energy calculations. An unexpectedly high magnetic hyperfine field for Fe atoms located at the tetrahedral Me(1) site in the Fe(2)P structure is found, The saturation moment derived from magnetic measurements corresponds to 4.4 mu(B)/f.u. at low temperatures, a value substantially higher than previously reported, but in accordance with the results from our electron structure calculations, This high saturation moment and the tunable first order ferromagnetic transition make the Fe(2-x)Mn(x)P(1-y)Si(y), system promising for magnetocaloric applications.

Keywords
electronic structure, iron alloys, magnetic moments, magnetic transitions, magnetocaloric effects, manganese alloys, Mossbauer effect, phosphorus alloys, silicon alloys, total energy
National Category
Physical Sciences Inorganic Chemistry Engineering and Technology
Research subject
Inorganic Chemistry; Engineering Science with specialization in Solid State Physics
Identifiers
urn:nbn:se:uu:diva-161941 (URN)10.1063/1.3651272 (DOI)000295883800051 ()
Available from: 2011-11-23 Created: 2011-11-21 Last updated: 2017-12-08
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