Abstract
Synchrotron X-ray and neutron powder diffraction were used to investigate the formation, structure and bonding in the double perovskite Ba 2− x 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; x ⩽ 0.3 cubic ( Fm 3 ¯ m ) with Tb 4+ and Ir 4+; 0.4 ⩽ x ⩽ 1.0 cubic ( Fm 3 ¯ m ) with Tb 3+ and Ir 5+ and x ⩾ 1.2 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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