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Symmetry‐mode analysis of the phase transitions in SrLaZnRuO 6 and SrLaMgRuO 6 ordered double perovskites
Author(s) -
IturbeZabalo E.,
Igartua J. M.,
Gateshki M.
Publication year - 2013
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889813013253
Subject(s) - monoclinic crystal system , phase diagram , crystallography , neutron diffraction , crystal structure , chemistry , phase transition , phase (matter) , space group , diffraction , symmetry (geometry) , x ray crystallography , condensed matter physics , physics , optics , geometry , mathematics , organic chemistry
The crystal structures of double perovskites SrLa M RuO 6 ( M = Zn and Mg) have been studied using X‐ray and neutron diffraction data. Both compounds have monoclinic structure at room temperature with space group P 2 1 / n . A first‐order structural phase transition P 2 1 / n → R has been observed in SrLaZnRuO 6 and SrLaMgRuO 6 , at about 800 and 500 K, respectively, with the two phases coexisting in a temperature interval of 150 K. The temperature‐ and tolerance‐factor‐dependent phase diagram of the SrLn M RuO 6 (Ln = La, Nd and Pr; M = Zn, Co, Cu, Mg and Ni) family shows two different phase transition sequences depending on the A ‐site cation. The structures of the title compounds at room and high temperatures have been analyzed using the symmetry‐mode decomposition approach.