Structural investigation of oxygen-deficient perovskite CaMnO2.75

Cyril C.K. Chiang; Kenneth R. Poeppelmeier

doi:10.1016/0167-577X(91)90066-F

Structural investigation of oxygen-deficient perovskite CaMnO_2.75

Cyril C.K. Chiang^*, Kenneth R. Poeppelmeier

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Perovskite CaMnO₃ and its oxygen-deficient derivatives have been prepared from solid solution precursor with a calcite-type structure. CaMnO_3-x phases are constructed from MnO₆ octahedra and MnO₅ square pyramids. From X-ray powder data CaMnO_2.75 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 language	English (US)
Pages (from-to)	102-108
Number of pages	7
Journal	Materials Letters
Volume	12
Issue number	1-2
DOIs	https://doi.org/10.1016/0167-577X(91)90066-F
State	Published - Sep 1991

Funding

The authors are grateful to Dr. Robert A. Beyer-lein and Dr. Michael E. Leonowicz for sample preparation. Dr. Frank J. Rotella at IPNS Division, Argonne National Laboratory is particularly acknowledgedf or his patient advice for use of the Rietveld refinement package.F inancial aid was provided by National Science Foundation of the United States (DMR 8610659).

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/0167-577X(91)90066-F

Cite this

@article{8b42e7c6409c4a9f987d4e99c7c11456,

title = "Structural investigation of oxygen-deficient perovskite CaMnO2.75",

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.",

author = "Chiang, {Cyril C.K.} and Poeppelmeier, {Kenneth R.}",

note = "Funding Information: The authors are grateful to Dr. Robert A. Beyer-lein and Dr. Michael E. Leonowicz for sample preparation. Dr. Frank J. Rotella at IPNS Division, Argonne National Laboratory is particularly acknowledgedf or his patient advice for use of the Rietveld refinement package.F inancial aid was provided by National Science Foundation of the United States (DMR 8610659).",

year = "1991",

month = sep,

doi = "10.1016/0167-577X(91)90066-F",

language = "English (US)",

volume = "12",

pages = "102--108",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier",

number = "1-2",

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TY - JOUR

T1 - Structural investigation of oxygen-deficient perovskite CaMnO2.75

AU - Chiang, Cyril C.K.

AU - Poeppelmeier, Kenneth R.

N1 - Funding Information: The authors are grateful to Dr. Robert A. Beyer-lein and Dr. Michael E. Leonowicz for sample preparation. Dr. Frank J. Rotella at IPNS Division, Argonne National Laboratory is particularly acknowledgedf or his patient advice for use of the Rietveld refinement package.F inancial aid was provided by National Science Foundation of the United States (DMR 8610659).

PY - 1991/9

Y1 - 1991/9

N2 - 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.

AB - 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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