Structural investigation of oxygen-deficient perovskite CaMnO2.75

Cyril C K Chiang, Kenneth R Poeppelmeier

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Abstract

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
Volume12
Issue number1-2
DOIs
Publication statusPublished - 1991

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Rietveld refinement
Calcium Carbonate
Calcite
Neutron diffraction
pyramids
Powders
Perovskite
Solid solutions
Oxygen
Derivatives
X rays
oxygen
calcite
neutron diffraction
solid solutions
cells
x rays
simulation
perovskite

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Structural investigation of oxygen-deficient perovskite CaMnO2.75. / Chiang, Cyril C K; Poeppelmeier, Kenneth R.

In: Materials Letters, Vol. 12, No. 1-2, 1991, p. 102-108.

Research output: Contribution to journalArticle

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abstract = "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.",
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