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Title

Crystal structures and temperature-induced phase transitions of Sr2Mn(2+)W(6+)O6, and of its transformation to Sr2Mn(3+)W(6+)O(6+δ)

AuthorsFaik, A.; Igartua, J. M.; Cuello, G. J. ; Jiménez-Villacorta, Félix ; Castro, Germán R. ; Lezama, Luis
KeywordsDouble Perovskite
X-ray diffraction
Crystal structure
Phase transitions
Issue Date12-Jun-2009
PublisherElsevier
CitationJournal of Molecular Structure 933(1-3): 53-62 (2009)
AbstractWe present a new effective method for synthesizing Sr2MWO6 double perovskite oxides: the co-precipitation route at 1220 K in nitrogen environment. Using conventional X-ray diffraction methods, we have confirmed the room-temperature space group of Sr2Mn(2+)WO6 to be P2(1)/n: Z = 2; a=5.6764(1)Ǻ; b=5.6752(1)Ǻ; c=8.0149(1)Ǻ; β=90.12(1)Ǻ and V=258.18(1)Å3. We show that the compound presents the following temperature induced phase-transition sequence: P2(1)/n -> I4/m -> Fm3m. After a thermal treatment, 24 h at 870 K in air, the Sr2Mn(2+)WO6 compound transforms irreversibly to Sr2Mn(3+)WO(6+δ). This transformation has been confirmed by EPR and XANES measurements. Using conventional X-ray diffraction methods, we have shown the room-temperature space group of Sr2Mn(3+)WO(6+δ) to be I4/m: Z = 2; a=5.6353(1)Ǻ; c=8.0149(1)Ǻ and V=254.53(1)Å3. We show that the compound presents the following temperature induced phase-transition sequence: I4/m(->I4/mmm) -> Fm3m. The tetragonal-to-tetragonal phase transition is suggested to be present, it is not observed as it is very weak; it is attributed to the presence of the Jahn-Teller active Mn3+ cation.
Description10 pages, 9 figures, 3 tables.-- Printed version published Sep 17, 2009.
Publisher version (URL)http://dx.doi.org/10.1016/j.molstruc.2009.06.008
URIhttp://hdl.handle.net/10261/17986
DOI10.1016/j.molstruc.2009.06.008
ISSN0022-2860
Appears in Collections:(ICMM) Artículos
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