Stefan Marion
University of Oslo
12 Papers
179 Citations
Stefan Marion is an academic researcher from University of Oslo. The author has contributed to research in topics: Phase transition & Conductivity. The author has an hindex of 10, co-authored 12 publications.
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Papers
Short-range ordering of oxygen vacancies in CaFexTi1 - xO3 - x/2 perovskites (0 < x < 0.4)
Catherine McCammon,Ana I. Becerro,Falko Langenhorst,Ross J. Angel,Stefan Marion,Friedrich Seifert +5 more
TL;DR: In this article, a model for short-range ordering of oxygen vacancies where clusters form chains of increasing length is proposed, which is consistent with conductivity results which show high ionic conductivity at moderately low Fe concentrations.
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Structural phase transitions and mixing behaviour of the ba-aluminate (BaAl2O4)-Sr-aluminate (SrAl2O4) solid solution
TL;DR: In this article, phase transitions in BaAl2O4-SrAl 2O4 solid solution have been analysed as a function of temperature and composition using infrared (IR) powder absorption spectroscopy.
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Spontaneous strain variations through the low temperature phase transitions of deuterated lawsonite
TL;DR: In this article, high-resolution neutron powder diffraction has been used to determine lattice parameter variations of deuterated lawsonite across the Cmcm ↔ Pmcn and pmcn↔ P 21 cn phase transitions, in the temperature interval 1.6-505 K.
Displacive components of the low-temperature phase transitions in lawsonite
Hinrich-Wilhelm Meyer,Stefan Marion,Peter Sondergeld,Michael A. Carpenter,Kevin S. Knight,Simon A. T. Redfern,Martin T. Dove +6 more
TL;DR: In this article, the phase transitions in deuterated lawsonite were investigated with high-resolution, time-of-flight neutron diffraction between 2 and 500 K. From the analysis of spontaneous strain data, the thermodynamics of the phase transition at 273 K are not changed by the deuteration process.
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Ionic and electronic conductivity in CaTi1−xFexO3−δ (x=0.1–0.3)
TL;DR: In this paper, electrical conductivity measurements on polycrystalline pressed and sintered tablets using the van der Pauw four point method in controlled atmospheres were performed on CaTi1−xFexO3−δ (x=0.1, 0.2, 0 3) were interpreted to reflect n-type, ionic and p-type conductivity at different oxygen partial pressures.
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