Abstract
Perovskite related solid solutions Sr 2− x La x CuTaO y (0 ⩽ x ⩽ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr 2− x La x CuTaO y system: simple cubic perovskite-type (0 ⩽ x ⩽ 0.7) and tetragonally distorted (NH 4) 3FeF 6-type (0.8 ⩽ x ⩽ 1.0). The average valency state of copper in these solid solutions was nearly equal to +2, which was determined by iodometric titration. A significant change of the cubic lattice parameter a was not observed, and the tetragonality ( c a ) increased with increasing La 3+ content. An ordering of Cu 2+ and Ta 5+ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu 2+.
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