Synthesis, structures and phase transitions in the double perovskites Sr 2- x Ca x CrNbO 6
Date
2006
Authors
Cheah, Melina C L
Kennedy, Brendan James
Withers, Raymond
Yonemura, Masao
Kamiyama, Takashi
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Academic Press
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 Fm over(3, -) m 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 Fm over(3, -) m transition, a suggestion supported by selected area electron diffraction studies. Crown
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Keywords
Keywords: Crystal structure; Electron diffraction; Neutron diffraction; Phase transitions; Synthesis (chemical); Thermal effects; Chromium niobium oxides; Monoclinic; Rock-salt ordered; Sr2CaCrNbO6; Perovskite Chromium niobium oxides; Perovskite; Phase transition
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Source
Journal of Solid State Chemistry
Type
Journal article
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2037-12-31
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