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High Temperature Raman Spectroscopy studies of the phase transitions in Sr2NiWO6 and Sr2MgWO6 double perovskite oxides
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
2010 (English)In: Journal of Molecular Structure, ISSN 0022-2860, E-ISSN 1872-8014, Vol. 971, no 1-3, 18-22 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, we report on high temperature Raman spectroscopy studies (up to 550 °C) of the phase transitions in Sr2BWO6 (B = Ni, Mg) double perovskite oxides. For both compounds, the transition from the tetragonal (I4/m) phase to the cubic (Fm-3m) phase is accompanied by considerable changes in the temperature dependence of the modes. To better view this phase transition, the FWHM temperature dependence of the most intense modes were studied; by this study, we have obtained a sensitive guide to the onset of the phase transition. A large increase of the FWHM with increasing temperature is observed for all modes in the spectrum, clear transitional effects were observed: the width behaves in a linear way as a function of temperature; when the temperature reached around 300 °C, a drop in the width of this mode was observed; thus, showing the phase transition occurrence for both compounds. This drop is much more illustrated in Ni-containing compound than in Sr2MgWO6.

Place, publisher, year, edition, pages
2010. Vol. 971, no 1-3, 18-22 p.
Keyword [en]
Phase transition, High temperature Raman spectroscopy, Double perovskite, Sr2NiWO6, Sr2MgWO6
National Category
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
URN: urn:nbn:se:uu:diva-119746DOI: 10.1016/j.molstruc.2010.02.060ISI: 000277950900004OAI: oai:DiVA.org:uu-119746DiVA: diva2:300778
Available from: 2010-03-01 Created: 2010-03-01 Last updated: 2010-12-22Bibliographically approved

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Solid Earth Geology
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