Synthesis, structures and phase transitions in the double perovskites Sr2-xCaxCrNbO6

Melina C.L. Cheah; Brendan J. Kennedy; Ray L. Withers; Masao Yonemura; Takashi Kamiyama

doi:10.1016/j.jssc.2006.04.047

Synthesis, structures and phase transitions in the double perovskites Sr_2-xCa_xCrNbO₆

Melina C.L. Cheah, Brendan J. Kennedy^*, Ray L. Withers, Masao Yonemura, Takashi Kamiyama

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The synthesis and crystal structures of nine members of the rock-salt ordered double perovskites Sr_2-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 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

Original language	English
Pages (from-to)	2487-2494
Number of pages	8
Journal	Journal of Solid State Chemistry
Volume	179
Issue number	8
DOIs	https://doi.org/10.1016/j.jssc.2006.04.047
Publication status	Published - Aug 2006

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title = "Synthesis, structures and phase transitions in the double perovskites Sr2-xCaxCrNbO6",

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",

keywords = "Chromium niobium oxides, Perovskite, Phase transition",

author = "Cheah, {Melina C.L.} and Kennedy, {Brendan J.} and Withers, {Ray L.} and Masao Yonemura and Takashi Kamiyama",

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TY - JOUR

T1 - Synthesis, structures and phase transitions in the double perovskites Sr2-xCaxCrNbO6

AU - Cheah, Melina C.L.

AU - Kennedy, Brendan J.

AU - Withers, Ray L.

AU - Yonemura, Masao

AU - Kamiyama, Takashi

PY - 2006/8

Y1 - 2006/8

N2 - 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

AB - 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

KW - Chromium niobium oxides

KW - Perovskite

KW - Phase transition

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U2 - 10.1016/j.jssc.2006.04.047

DO - 10.1016/j.jssc.2006.04.047

M3 - Article

SN - 0022-4596

VL - 179

SP - 2487

EP - 2494

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 8

ER -

Synthesis, structures and phase transitions in the double perovskites Sr_2-xCa_xCrNbO₆

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