Cation ordering in the perovskite-type Sr2-xLaxCo1-yTa1+yO6

Sumio Kato, Tatsuhiro Kawase, Yozo Ohshima, Mikio Sugai, Hirotsugu Takizawa, Tadashi Endo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Perovskite-related solid solutions, Sr2-xLaxCu1-yTa1+yOz, 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(Sr1/3Ta2/3)O3-type (1:2 ordering) and the (NH4)3FeF6-type (1:1 ordering). The 1:2 ordering phase formed near the Sr2(Co0.67Ta1.33)O6 composition. In the composition range, 0≤y≤0.2, the random and the 1:1 ordered phases formed. In the higher La3+ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La3+ 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.

Original languageEnglish
Pages (from-to)64-68
Number of pages5
JournalJournal of Alloys and Compounds
Issue number1-2 Complete
Publication statusPublished - 1999 Jun 30

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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