Synthesis and lattice distortion of the perovskite-type oxides Sr2(Sr1-xMx)TaOz(M = Ca, Nd)

Sumio Kato, Takeshi Abe, Mikio Sugai, Hirotsugu Takizawa, Tadashi Endo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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-xNd0.1)TaOz. The unit cell of the solid solutions for :c=0.30.7 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).

Original languageEnglish
Pages (from-to)633-638
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume107
Issue number7
DOIs
Publication statusPublished - 1999

Keywords

  • Lattice distortion
  • Oxygen defect
  • Perovskite
  • Tolerance factor

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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