Synthesis and crystal structure of Sr2-xLaxCuTaOy

Sumio Kato, Tsuyoshi Makita, Mikio Sugai, Yozo Ohshima, Hirotsugu Takizawa, Tadashi Endo

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Perovskite related solid solutions Sr2-xLaxCuTaOy (0 ≤ x ≤ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr2-xLaxCuTaOy system: simple cubic perovskite-type (0 ≤ x ≤ 0.7) and tetragonally distorted (NH4)3FeF6-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 La3+ content. An ordering of Cu2+ and Ta5+ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu2+.

Original languageEnglish
Pages (from-to)36-38
Number of pages3
JournalJournal of Alloys and Compounds
Volume243
Issue number1-2
DOIs
Publication statusPublished - 1996 Oct 15

Keywords

  • Cation ordering
  • Jahn-Teller distortion
  • Perovskite

ASJC Scopus subject areas

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

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