High Temperature Raman Spectroscopy studies of the phase transitions in Sr2NiWO6 and Sr2MgWO6 double perovskite oxides
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
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.
Phase transition, High temperature Raman spectroscopy, Double perovskite, Sr2NiWO6, Sr2MgWO6
Research subject Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
IdentifiersURN: urn:nbn:se:uu:diva-119746DOI: 10.1016/j.molstruc.2010.02.060ISI: 000277950900004OAI: oai:DiVA.org:uu-119746DiVA: diva2:300778