Acta Cryst. (2006). E62, i13-i16  [ doi:10.1107/S1600536805040973 ]

A non-centrosymmetric polymorph of Gd₃RuO₇

N. Ishizawa, K. Hiraga, D. du Boulay, H. Hibino, T. Ida and S. Oishi

Abstract: A new non-centrosymmetric modification has been found for trigadolinium ruthenium heptaoxide, Gd₃RuO₇, crystallizing in the space group P2₁nb. The structure is composed of infinite single chains of corner-linked [RuO₆] octahedra embedded in the [Gd₃O] matrix. The octahedra in the P2₁nb modification have two tilt systems about the a and c axes, in contrast to the previously reported Cmcm modification [Bontchev et al. (2000). Phys. Rev. B, 62, 12235-12240], with only one tilt system about the a axis. Changes in the coordination of Gd atoms in the title compound are closely related to the tilting mechanism about the c axis.

Online 14 December 2005

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