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Independent structural and valence state transitions in the cation-ordered double perovskites Ba2−xSrxTbIrO6

✍ Scribed by Qingdi Zhou; Brendan J. Kennedy

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
585 KB
Volume
178
Category
Article
ISSN
0022-4596

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✦ Synopsis

Synchrotron X-ray and neutron powder diffraction were used to investigate the formation, structure and bonding in the double perovskite Ba 2Àx Sr x TbIrO 6 solid solutions. The results showed that these oxides all exhibit ordering of the Tb and Ir cations in a double perovskite-type structure. Three distinct structural types differing in symmetry and/or valence states were formed depending on the precise Ba:Sr ratio on the perovskite A site; xp0:3 cubic (Fm 3m) with Tb 4+ and Ir 4+ ; 0:4pxp1:0 cubic (Fm 3m) with Tb 3+ and Ir 5+ and xX1:2 monoclinic (P2 1 /n) with Tb 3+ and Ir 5+ . The transitions between these appear to be first order in nature.

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