Synthesis, structures and phase transitions in the double perovskites Sr2−xCaxCrNbO6 |
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Authors: | Melina C.L. Cheah Ray L. Withers Takashi Kamiyama |
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Affiliation: | 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 |
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Abstract: | The synthesis and crystal structures of nine members of the rock-salt ordered double perovskites Sr2−xCaxCrNbO6 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. |
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Keywords: | Perovskite Phase transition Chromium niobium oxides |
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