Abstract
Abstract Perovskite-related solid solutions, Sr 2− x La x Cu 1− y Ta 1+ y O z , were synthesized by solid-state reaction at 1200°C in air. The crystalline phases were identified by powder X-ray diffraction. The perovskite-type solid solutions with different ordering types were observed including simple cubic perovskite-type (random), the Ba(Sr 1/3 Ta 2/3 )O 3 -type (1:2 ordering) and the (NH 4 ) 3 FeF 6 -type (1:1 ordering). The 1:2 ordering phase formed near the Sr 2 (Co 0.67 Ta 1.33 )O 6 composition. In the composition range, 0≤ y ≤0.2, the random and the 1:1 ordered phases formed. In the higher La 3+ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La 3+ content and the perovskite cell expanded resulting from the increase of the average ionic radii on (Co,Ta) site. The 1:1 ordering of the ions on the octahedral site was found to be affected by the size difference of the ions more than the charge difference in this system.
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