X-ray study of the deficient perovskite La 2 3TiO3

Masanori Abe, Kenji Uchino

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Abstract

The A-site deficient perovskite La 2 3TiO3 was synthesized under the controlled atmosphere of CO2H2 mixed gas at 1350°C, and the structure was investigated by the powder X-ray diffraction method. The product is slightly oxygen deficient (La 2 3TiO3-λ, where 0.007 ≦ λ ≦ 0.079), and the structure is dependent on λ: when λ is small, the perovskite cell is distorted to orthorhombic symmetry and the unit cell is doubled along the c′ (> b′, a′) axis, while a cubic perovskite structure is facilitated with the increase of λ. A structural model, which calls for an ordered arrangement of the A-site vacancies along the c′-axis, is proposed and its order parameter is calculated from the intensities of the superstructure lines.

Original languageEnglish (US)
Pages (from-to)147-155
Number of pages9
JournalMaterials Research Bulletin
Volume9
Issue number2
DOIs
StatePublished - Jan 1 1974

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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