Structural investigation of oxygen-deficient perovskite CaMnO2.75

Cyril C K Chiang, Kenneth R Poeppelmeier

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Perovskite CaMnO3 and its oxygen-deficient derivatives have been prepared from solid solution precursor with a calcite-type structure. CaMnO3-x phases are constructed from MnO6 octahedra and MnO5 square pyramids. From X-ray powder data CaMnO2.75 75 was indexed on an orthorhombic cell with a = 5.35(1) A ̊, b = 20.96(2) A ̊ and c = 7.47(1) A ̊. Rietveld refinement of time-of-flight neutron diffraction data was attempted for several models containing 50 mol% MnO5 and 50 mol% MnO6 based on MnO6 octahedra and MnO5 square pyramids, but the results were inconclusive. Simulation patterns illustrate the intrinsic difficulty for structural comprehension.

Original languageEnglish
Pages (from-to)102-108
Number of pages7
JournalMaterials Letters
Issue number1-2
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Materials Science(all)

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