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Temperature induced structural phase transition in Sr3-xCaxFe2TeO9 (0 <= x <= 1) probed by Raman and Mossbauer techniques
Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco..
Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.;Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco..
Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.;Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco..
Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco..
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2017 (English)In: Journal of Molecular Structure, ISSN 0022-2860, E-ISSN 1872-8014, Vol. 1141, 484-494 p.Article in journal (Refereed) Published
Abstract [en]

A series of perovskites Sr3-xCaxFe2TeO9 (0 <= x <= 1) have been prepared in polycrystalline form by solid-state reaction method in air. These materials have been studied by X-ray powder diffraction method (XRPD) and Raman spectroscopy. An analysis of the XRD patterns at room temperature has shown that these compounds crystallize in a tetragonal system, space group I4/m. The structure contains alternating (Fe/Te)(2a)O-6 and (Fe/Te)(2b)O-6 octahedra, tilted in anti-phase in the basal ab-plane. The study of Raman spectroscopy at various temperatures shows a transition from tetragonal to cubic phase: I4/m -> Fm (3) over bar m. This phase transition occurs at high-temperature. Analysis of Raman spectra recorded at several temperatures shows that this phase transition appears near similar to 375 degrees C for (x = 0), similar to 435 degrees C for (x = 0.5) and similar to 451 degrees C for (x = 1). A proportional and gradual increase of temperature phase transition is observed as function of the calcium amount.

Place, publisher, year, edition, pages
2017. Vol. 1141, 484-494 p.
Keyword [en]
Double perovskite, Crystal structure, Phase transition, X-ray diffraction, Raman spectroscopy, Mossbauer spectroscopy
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-323746DOI: 10.1016/j.molstruc.2017.03.118ISI: 000401593400057OAI: oai:DiVA.org:uu-323746DiVA: diva2:1108920
Funder
Swedish Research Council, 348-2014-4287
Available from: 2017-06-13 Created: 2017-06-13 Last updated: 2017-06-13Bibliographically approved

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