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X-ray diffraction and Raman spectroscopy studies of temperature and composition induced phase transitions in Ba2-xSrxMgTeO6 (0 <= x <= 2)
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2014 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 603, 86-94 p.Article in journal (Refereed) Published
Abstract [en]

X-ray diffraction and Raman spectroscopy studies of Sr-substituted double perovskite compounds Ba2-xSrxMgTeO6 with (0 <= x <= 2) were carried out. At room temperature, both Rietveld refinements and Raman studies showed that two phase transitions occurred as a function of increased strontium content; from cubic to tetragonal structure, at x similar to 1.5(1), and from the tetragonal to monoclinic structure at x similar to 1.9(1). Furthermore, upon temperature increase up to 430 degrees C, the monoclinic and tetragonal perovskites manifest transformations to the tetragonal and cubic symmetries, and to the cubic symmetry, respectively. For this series, the transitions show considerable changes in the compositional and temperature dependencies of the modes, the spectral positions of which exhibit a linear behavior. The symmetry transformations between the encountered three crystal systems is revealed by significant changes of the slopes. (C) 2014 Elsevier B. V. All rights reserved.

Place, publisher, year, edition, pages
2014. Vol. 603, 86-94 p.
Keyword [en]
Ba2-xSrxMgTeO6 double perovskite oxides, Phase transition, X-ray diffraction, Rietveld refinements, High temperature, Raman spectroscopy
National Category
Earth and Related Environmental Sciences Geosciences, Multidisciplinary
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-227170DOI: 10.1016/j.jallcom.2014.03.037ISI: 000335505100014OAI: oai:DiVA.org:uu-227170DiVA: diva2:730201
Available from: 2014-06-27 Created: 2014-06-24 Last updated: 2017-12-05Bibliographically approved

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Lazor, Peter

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