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X-ray diffraction and Raman spectroscopy studies of temperature and composition induced phase transitions in Ba2-xSrxZnWO6 (0 <= x <= 2) double perovskite oxides
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2012 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, Vol. 533, 43-52 p.Article in journal (Refereed) Published
Abstract [en]

X-ray diffraction and Raman spectroscopy studies of Sr doped double perovskites compound Ba2-xSrxZnWO6 with (0 <= x <= 2) were investigated. As a function of composition while increasing strontium amount, the samples show two phase transitions from cubic to tetragonal phase and from tetragonal to monoclinic structure. Both Rietveld refinements and Raman studies showed that the first phase transition occurs between x = 1 and 1.2; the second phase transition is observed around x = 2. Furthermore, increasing the temperature for the compositions (1.2 <= x <= 2), manifests the tetragonal to cubic phase transition. For x = 2 two phase transitions were observed as a function of temperature. For this series, the phase transitions are illustrated by considerable changes in the composition and temperature dependence of the modes. All the Raman modes show a linear behavior when the composition or temperature is increased, then the slope change indicating the symmetry change.

Place, publisher, year, edition, pages
2012. Vol. 533, 43-52 p.
Keyword [en]
Ba2-xSrxZnWO6 double perovskite oxides, Phase transition, Rietveld refinements, High temperature Raman spectroscopy
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
URN: urn:nbn:se:uu:diva-178995DOI: 10.1016/j.jallcom.2012.03.075ISI: 000306092600009OAI: oai:DiVA.org:uu-178995DiVA: diva2:543275
Available from: 2012-08-07 Created: 2012-08-06 Last updated: 2012-12-17Bibliographically approved

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Lazor, Peter
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Solid Earth Geology
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