Synthesis, structures and phase transitions in the double perovskites Sr2−xCaxCrNbO6期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Synthesis, structures and phase transitions in the double perovskites Sr₂₋_xCa_xCrNbO₆

Authors:	Melina CL Cheah Ray L Withers Takashi Kamiyama

Institution:	^a School of Chemistry, The University of Sydney, Sydney, NSW 2006 Australia ^b Research School of Chemistry, Australian National University, Canberra ACT 2600, Australia ^c Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573, Japan

Abstract:	The synthesis and crystal structures of nine members of the rock-salt ordered double perovskites Sr₂₋_xCa_xCrNbO₆ is presented. The crystal structures of the end members of the series Sr₂CrNbO₆ and Ca₂CrNbO₆ were refined using powder neutron diffraction data and are cubic in and monoclinic in P2₁/n, respectively, in both cases there being considerable anti-site Cr-Nb mixing. Variable temperature and/or composition studies suggest a direct first-order P2₁/n to transition, a suggestion supported by selected area electron diffraction studies.

Keywords:	Perovskite Phase transition Chromium niobium oxides
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