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Compression mechanisms of symmetric and Jahn–Teller distorted octahedra in double perovskites: A2CuWO6 (A=Sr, Ba), Sr2CoMoO6, and La2LiRuO6

✍ Scribed by Michael W. Lufaso; William R. Gemmill; Samuel J. Mugavero III; Yongjae Lee; Thomas Vogt; Hans-Conrad zur Loye

Book ID: 104029689
Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 234 KB
Volume: 179
Category: Article
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2006.07.016

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✦ Synopsis

Synchrotron X-ray powder diffraction was used to study the high pressure dependence of the lattice parameter and structural evolution of the monoclinic La 2 LiRuO 6 and tetragonal Sr 2 CoMoO 6 , Sr 2 CuWO 6 , and Ba 2 CuWO 6 double perovskite phases. The c lattice parameters of Sr 2 CuWO 6 and Ba 2 CuWO 6 decreased more rapidly than the a lattice parameters and Ba 2 CuWO 6 exhibited a more anisotropic compression compared to Sr 2 CuWO 6 . Based on lower pressure refinements of Ba 2 CuWO 6 , the anisotropic compression is proposed to be due to the preferential compression of the Cu-O bonds containing cooperative Jahn-Teller distortions aligned parallel to the c-axis, which is in contrast to Sr 2 CoMoO 6 , where the change in the octahedral tilting and symmetric bond compression is the prevailing compression mechanism. The bulk moduli were obtained from a fit of the volume-pressure data using the second-order Murnaghan equation of state.

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