Abstract
Incommensurately modulated structure of the composite crystal InCr 1− x Ti x O 3+ x/2 was refined by the profile fitting of powder X-ray diffraction based on the four-dimensional superspace group. The crystal consists of two monoclinic subsystems mutually incommensurate in b. The first subsystem is the alternate stacking of an edge-shared InO 6 octahedral layer and a Cr/Ti triangle-lattice plane along c *. A sheet of oxygen atoms constructing the second subsystem is also extending on the Cr/Ti plane. The whole structure is the alternate stacking of an edge-shared InO 6 octahedral layer and a Cr/Ti–O plane, where displacive modulation of O ions is prominent. Metal ions on the Cr/Ti–O plane are surrounded by three or four oxygen ions on the plane and, in addition, two axial ones.
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