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The perovskite-type solid solutions Sr2(Sr1-xMx)TaOz (M=Ca, Nd) were synthesized. Lattice distortion and cation ordering in the octahedral site of the perovskite type structure were investigated using Rietveld analysis of powder X-ray diffraction data. Cubic perovskite-type phases with cation ordering in octahedral site were obtained for Sr2(Sr1-xCax)TaO5.5 (x=0-1), and Sr2(Sr0.9Nd0.1)TaO5.55. Two types of monoclinic perovskite-type phases were obtained for Sr2(Sr1-xNdx)TaOz. The unit cell of the solid solutions for x=0.3-0.7 was close to a tetragonal cell. The distortion of the solid solutions was due to tilting octahedra and a difference in the direction of tilt was observed between the compounds for x=0.3-0.7 and x=0.9-1.0. Degree of monoclinic distortion increased with increasing Nd3+ content. Cation ordering in the octahedral sites was observed in all the compositions investigated for Sr2(Sr1-xNdx)TaOz. Increase of Nd3+ content possibly causes increase of oxygen content z. The present results suggest that increase of oxygen content is one of the reasons to cause the lattice distortion for Sr2(Sr1-xMx)TaOz (M=Ca, Nd).

Synthesis and Lattice Distortion of the Perovskite-Type Oxides Sr2(Sr1-xMx)TaOz(M=Ca, Nd).