X-ray structural study of calcium manganese oxide by rietveld analysis at high temperatures [Ca2MnO4.00]

Junichi Takahashi, Naoki Kamegashira

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The structure of the polycrystalline Ca2MnO4.00 has been investigated by high-temperature X-ray diffractometry and Rietveld analysis. The polycrystalline Ca2MnO4.00 has the K2NiF4-type tetragonal ( I41 acd) super structure (a={check mark}2a′, c=2c′) of tetragonal ( I4 mmm) primitive structure in the temperature range 298-977K in air. The composition remains unchanged during further conditions. This I41 acd super structure contains the rotated MnO6 octahedra about their c axes, and magnitude of the rotation decreases with increasing temperature. The temperature dependence of the a parameter is governed by the rotation of the MnO6 polyhedra, and that of the c parameter is dominated by the tetragonal distortion of the CaO arrangements in the structure.

Original languageEnglish
Pages (from-to)565-573
Number of pages9
JournalMaterials Research Bulletin
Volume28
Issue number6
DOIs
Publication statusPublished - 1993 Jun
Externally publishedYes

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'X-ray structural study of calcium manganese oxide by rietveld analysis at high temperatures [Ca<sub>2</sub>MnO<sub>4.00</sub>]'. Together they form a unique fingerprint.

  • Cite this