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Title: Structure and magnetism of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21)

Abstract

The synthesis and structure determination of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21) is described. Neutron powder diffraction data unambiguously show the anion vacancies in the oxygen-deficient phases lie in the hexagonal BaO{sub 3-x} layers, rather than the cubic layers predicted by previous structural models. The localization of anion vacancies in the hexagonal layers is discussed on the basis of the local co-ordination polyhedra of the metal cations. Low-temperature neutron diffraction data show the oxidized materials adopt antiferromagnetic ordered structures (Ba{sub 0.5}Sr{sub 0.5}MnO{sub 2.99}: T{sub N}=265K). Anion-deficient phases do not achieve magnetic order suggesting the Mn(III/IV) charge disorder suppresses long-range magnetic order.

Authors:
 [1];  [2]
  1. Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR (United Kingdom)
  2. Department of Chemistry, Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR (United Kingdom). E-mail: michael.hayward@chem.ox.ac.uk
Publication Date:
OSTI Identifier:
20784832
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 1; Other Information: DOI: 10.1016/j.jssc.2005.09.046; PII: S0022-4596(05)00448-2; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANIONS; ANTIFERROMAGNETISM; BARIUM COMPOUNDS; CATIONS; LAYERS; MANGANESE COMPOUNDS; NEUTRON DIFFRACTION; OXIDES; PEROVSKITE; STRONTIUM COMPOUNDS; STRUCTURAL MODELS; SYNTHESIS; VACANCIES

Citation Formats

Adkin, Josephine J., and Hayward, Michael A.. Structure and magnetism of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21). United States: N. p., 2006. Web. doi:10.1016/j.jssc.2005.09.046.
Adkin, Josephine J., & Hayward, Michael A.. Structure and magnetism of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21). United States. doi:10.1016/j.jssc.2005.09.046.
Adkin, Josephine J., and Hayward, Michael A.. Sun . "Structure and magnetism of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21)". United States. doi:10.1016/j.jssc.2005.09.046.
@article{osti_20784832,
title = {Structure and magnetism of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21)},
author = {Adkin, Josephine J. and Hayward, Michael A.},
abstractNote = {The synthesis and structure determination of 4H-BaMnO{sub 3-x} (0=<x=<0.35) and 4H-Ba{sub 0.5}Sr{sub 0.5}MnO{sub 3-x} (0=<x=<0.21) is described. Neutron powder diffraction data unambiguously show the anion vacancies in the oxygen-deficient phases lie in the hexagonal BaO{sub 3-x} layers, rather than the cubic layers predicted by previous structural models. The localization of anion vacancies in the hexagonal layers is discussed on the basis of the local co-ordination polyhedra of the metal cations. Low-temperature neutron diffraction data show the oxidized materials adopt antiferromagnetic ordered structures (Ba{sub 0.5}Sr{sub 0.5}MnO{sub 2.99}: T{sub N}=265K). Anion-deficient phases do not achieve magnetic order suggesting the Mn(III/IV) charge disorder suppresses long-range magnetic order.},
doi = {10.1016/j.jssc.2005.09.046},
journal = {Journal of Solid State Chemistry},
number = 1,
volume = 179,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}