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Title: Synthesis and characterization of La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}M{sub 0.5}O{sub 4-{delta}} (M=Fe, Mn)

Abstract

The M{sup 4+}-containing K{sub 2}NiF{sub 4}-type phases La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} have been synthesized by a sol-gel procedure and characterized by X-ray powder diffraction, thermal analysis, neutron powder diffraction and Moessbauer spectroscopy. Oxide ion vacancies are created in these materials via reduction of M{sup 4+} to M{sup 3+} and of Co{sup 3+} to Co{sup 2+}. The vacancies are confined to the equatorial planes of the K{sub 2}NiF{sub 4}-type structure. A partial reduction of Mn{sup 3+} to Mn{sup 2+} also occurs to achieve the oxygen stoichiometry in La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 3.6}. La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 3.65} contains Co{sup 2+} and Fe{sup 3+} ions which interact antiferromagnetically and result in noncollinear magnetic order consistent with the tetragonal symmetry. Competing ferromagnetic and antiferromagnetic interactions in La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4}, La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 3.6} induce spin glass properties in these phases. - Graphical abstract: La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} have been synthesized by a sol-gel procedure and characterized by diffraction techniques, thermal analysis and Moessbauer spectroscopy. Oxide ion vacancies, created via reduction, aremore » located in the equatorial planes of the K{sub 2}NiF{sub 4}-type structure. La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 3.65} shows antiferromagnetic, noncollinear magnetic order, whereas competing ferromagnetic and antiferromagnetic interactions in La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4}, La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 3.6} induce spin glass behaviour.« less

Authors:
 [1];  [2];  [1];  [1]
  1. School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom)
  2. Instituto de Quimica-Fisica 'Rocasolano', Consejo Superior de Investigaciones Cientificas, Serrano 119, 28006 Madrid (Spain)
Publication Date:
OSTI Identifier:
21370549
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 182; Journal Issue: 8; Other Information: DOI: 10.1016/j.jssc.2009.06.010; PII: S0022-4596(09)00264-3; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; COBALT COMPOUNDS; COBALT IONS; IRON COMPOUNDS; IRON IONS; LANTHANUM COMPOUNDS; MANGANESE COMPOUNDS; MANGANESE IONS; MOESSBAUER EFFECT; NEUTRON DIFFRACTION; OXIDES; REDUCTION; SOL-GEL PROCESS; SPIN GLASS STATE; STRONTIUM COMPOUNDS; SYNTHESIS; THERMAL ANALYSIS; VACANCIES; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DIFFRACTION; IONS; MAGNETISM; OXYGEN COMPOUNDS; POINT DEFECTS; RARE EARTH COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS

Citation Formats

El Shinawi, H, Marco, J F, Berry, F J, Department of Chemistry, Open University, Milton Keynes MK7 6AA, and Greaves, C. Synthesis and characterization of La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}M{sub 0.5}O{sub 4-{delta}} (M=Fe, Mn). United States: N. p., 2009. Web. doi:10.1016/j.jssc.2009.06.010.
El Shinawi, H, Marco, J F, Berry, F J, Department of Chemistry, Open University, Milton Keynes MK7 6AA, & Greaves, C. Synthesis and characterization of La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}M{sub 0.5}O{sub 4-{delta}} (M=Fe, Mn). United States. https://doi.org/10.1016/j.jssc.2009.06.010
El Shinawi, H, Marco, J F, Berry, F J, Department of Chemistry, Open University, Milton Keynes MK7 6AA, and Greaves, C. Sat . "Synthesis and characterization of La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}M{sub 0.5}O{sub 4-{delta}} (M=Fe, Mn)". United States. https://doi.org/10.1016/j.jssc.2009.06.010.
@article{osti_21370549,
title = {Synthesis and characterization of La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}M{sub 0.5}O{sub 4-{delta}} (M=Fe, Mn)},
author = {El Shinawi, H and Marco, J F and Berry, F J and Department of Chemistry, Open University, Milton Keynes MK7 6AA and Greaves, C},
abstractNote = {The M{sup 4+}-containing K{sub 2}NiF{sub 4}-type phases La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} have been synthesized by a sol-gel procedure and characterized by X-ray powder diffraction, thermal analysis, neutron powder diffraction and Moessbauer spectroscopy. Oxide ion vacancies are created in these materials via reduction of M{sup 4+} to M{sup 3+} and of Co{sup 3+} to Co{sup 2+}. The vacancies are confined to the equatorial planes of the K{sub 2}NiF{sub 4}-type structure. A partial reduction of Mn{sup 3+} to Mn{sup 2+} also occurs to achieve the oxygen stoichiometry in La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 3.6}. La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 3.65} contains Co{sup 2+} and Fe{sup 3+} ions which interact antiferromagnetically and result in noncollinear magnetic order consistent with the tetragonal symmetry. Competing ferromagnetic and antiferromagnetic interactions in La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4}, La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 3.6} induce spin glass properties in these phases. - Graphical abstract: La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} have been synthesized by a sol-gel procedure and characterized by diffraction techniques, thermal analysis and Moessbauer spectroscopy. Oxide ion vacancies, created via reduction, are located in the equatorial planes of the K{sub 2}NiF{sub 4}-type structure. La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 3.65} shows antiferromagnetic, noncollinear magnetic order, whereas competing ferromagnetic and antiferromagnetic interactions in La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Fe{sub 0.5}O{sub 4}, La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 4} and La{sub 0.8}Sr{sub 1.2}Co{sub 0.5}Mn{sub 0.5}O{sub 3.6} induce spin glass behaviour.},
doi = {10.1016/j.jssc.2009.06.010},
url = {https://www.osti.gov/biblio/21370549}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 8,
volume = 182,
place = {United States},
year = {2009},
month = {8}
}