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Temperature and composition induced phase transitions in Sr2-xCa1+xTeO6 (0 <= x <= 2) double perovskite oxides
Univ Hassan 1er, LS3M, Khouribga 25000, Morocco..
Univ Hassan 1er, LS3M, Khouribga 25000, Morocco.;Mohammed VI Polytech Univ, Ctr Adv Mat, Lot 660 Hay Moulay Rachid, Ben Guerir 43150, Morocco..
Univ Hassan 1er, LS3M, Khouribga 25000, Morocco..
Mohammed VI Polytech Univ, Ctr Adv Mat, Lot 660 Hay Moulay Rachid, Ben Guerir 43150, Morocco.;Univ Cadi Ayyad, FST Marrakech, LCME, Av A Khattabi, Marrakech 40000, Morocco..
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2017 (English)In: Journal of Molecular Structure, ISSN 0022-2860, E-ISSN 1872-8014, Vol. 1131, 103-113 p.Article in journal (Refereed) Published
Abstract [en]

Structures of Sr2-xCa1+xTeO6 double perovskites have been studied by the profile analysis of X-ray diffraction data and Raman spectroscopy at room temperature. This series adopts a monoclinic symmetry for the compositions (0 <= x <= 0.5) with P2(1)/n as space group and a triclinic system with P (1) over bar space group for the compositions (0.5 < x <= 2). These results were confirmed by the observed tolerance factor calculated from the distances obtained from the Rietveld refinements which indicates that the true tilt system for the compositions range (0.5 < x <= 2) is the triclinic tilt system. Clear changes in the Raman modes centered at 600, 610 and 620 cm(-1) and the FWHM of O-Te-O bending vibrations, centered at 738 cm(-1) confirmed that the triclinic symmetry takes place between the compositions x = 0.5 and x = 1. Furthermore, Raman spectroscopy studies at high temperature were done for Ca3TeO6. For this compound, considerable changes in the temperature dependence of the modes were well illustrated.

Place, publisher, year, edition, pages
2017. Vol. 1131, 103-113 p.
Keyword [en]
Inorganic compounds, X-ray diffraction, Raman spectroscopy, Crystal structure, Phase transition
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-316406DOI: 10.1016/j.molstruc.2016.11.036ISI: 000392683600012OAI: oai:DiVA.org:uu-316406DiVA: diva2:1078090
Funder
Swedish Research Council, 348- 2014-4287
Available from: 2017-03-02 Created: 2017-03-02 Last updated: 2017-03-02Bibliographically approved

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