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Title: Synthesis and characterization of La{sub 1+x}Sr{sub 2-x}CoMnO{sub 7-{delta}}(x=0,0.2; {delta}=0,1)

Abstract

The n=2 Ruddlesden-Popper phases LaSr{sub 2}CoMnO{sub 7} and La{sub 1.2}Sr{sub 1.8}CoMnO{sub 7} have been synthesized by a sol-gel method. The O6-type phases LaSr{sub 2}CoMnO{sub 6} and La{sub 1.2}Sr{sub 1.8}CoMnO{sub 6} were produced by reduction of the O7 phases under a hydrogen atmosphere. The materials crystallize in the tetragonal I4/mmm space group with no evidence of long-range cation order in the neutron and electron diffraction data. Oxygen vacancies in the reduced materials are located primarily at the common apex of the double perovskite layers giving rise to square pyramidal coordination around cobalt and manganese ions. The oxidation states Co{sup 3+}/Mn{sup 4+} and Co{sup 2+}/Mn{sup 3+} predominate in the as-prepared and reduced materials, respectively. The materials are spin glasses at low temperature and the dominant magnetic interactions change from ferro- to antiferromagnetic following reduction. - Graphical abstract: The n=2 Ruddlesden-Popper phases LaSr{sub 2}CoMnO{sub 7}, La{sub 1.2}Sr{sub 1.8}CoMnO{sub 7}, LaSr{sub 2}CoMnO{sub 6} and La{sub 1.2}Sr{sub 1.8}CoMnO{sub 6} are synthesized and characterized.

Authors:
 [1]; ;  [2]; ; ;  [3];  [1];  [1]
  1. School of Chemistry, University of Birmingham, Birmingham B15 2TT (United Kingdom)
  2. EMAT, RUCA, Groenenborgerlaan 171, Antwerp 2020 (Belgium)
  3. Instituto de Quimica-Fisica 'Rocasolano', Serrano 119, CSIC, 28006 Madrid (Spain)
Publication Date:
OSTI Identifier:
21421521
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 183; Journal Issue: 6; Other Information: DOI: 10.1016/j.jssc.2010.04.018; PII: S0022-4596(10)00151-9; Copyright (c) 2010 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; ELECTRON DIFFRACTION; LANTHANUM COMPOUNDS; MANGANESE COMPOUNDS; MANGANESE IONS; NEUTRON DIFFRACTION; OXIDES; PEROVSKITE; SOL-GEL PROCESS; SPACE GROUPS; SPIN GLASS STATE; STRONTIUM COMPOUNDS; SYNTHESIS; TETRAGONAL LATTICES; VACANCIES; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; IONS; MAGNETISM; MINERALS; OXIDE MINERALS; OXYGEN COMPOUNDS; PEROVSKITES; POINT DEFECTS; RARE EARTH COMPOUNDS; SCATTERING; SYMMETRY GROUPS; TRANSITION ELEMENT COMPOUNDS

Citation Formats

El Shinawi, H, Bertha, A, Hadermann, J, Herranz, T, Santos, B, Marco, J F, Berry, F J, and Greaves, C. Synthesis and characterization of La{sub 1+x}Sr{sub 2-x}CoMnO{sub 7-{delta}}(x=0,0.2; {delta}=0,1). United States: N. p., 2010. Web. doi:10.1016/j.jssc.2010.04.018.
El Shinawi, H, Bertha, A, Hadermann, J, Herranz, T, Santos, B, Marco, J F, Berry, F J, & Greaves, C. Synthesis and characterization of La{sub 1+x}Sr{sub 2-x}CoMnO{sub 7-{delta}}(x=0,0.2; {delta}=0,1). United States. https://doi.org/10.1016/j.jssc.2010.04.018
El Shinawi, H, Bertha, A, Hadermann, J, Herranz, T, Santos, B, Marco, J F, Berry, F J, and Greaves, C. 2010. "Synthesis and characterization of La{sub 1+x}Sr{sub 2-x}CoMnO{sub 7-{delta}}(x=0,0.2; {delta}=0,1)". United States. https://doi.org/10.1016/j.jssc.2010.04.018.
@article{osti_21421521,
title = {Synthesis and characterization of La{sub 1+x}Sr{sub 2-x}CoMnO{sub 7-{delta}}(x=0,0.2; {delta}=0,1)},
author = {El Shinawi, H and Bertha, A and Hadermann, J and Herranz, T and Santos, B and Marco, J F and Berry, F J and Greaves, C},
abstractNote = {The n=2 Ruddlesden-Popper phases LaSr{sub 2}CoMnO{sub 7} and La{sub 1.2}Sr{sub 1.8}CoMnO{sub 7} have been synthesized by a sol-gel method. The O6-type phases LaSr{sub 2}CoMnO{sub 6} and La{sub 1.2}Sr{sub 1.8}CoMnO{sub 6} were produced by reduction of the O7 phases under a hydrogen atmosphere. The materials crystallize in the tetragonal I4/mmm space group with no evidence of long-range cation order in the neutron and electron diffraction data. Oxygen vacancies in the reduced materials are located primarily at the common apex of the double perovskite layers giving rise to square pyramidal coordination around cobalt and manganese ions. The oxidation states Co{sup 3+}/Mn{sup 4+} and Co{sup 2+}/Mn{sup 3+} predominate in the as-prepared and reduced materials, respectively. The materials are spin glasses at low temperature and the dominant magnetic interactions change from ferro- to antiferromagnetic following reduction. - Graphical abstract: The n=2 Ruddlesden-Popper phases LaSr{sub 2}CoMnO{sub 7}, La{sub 1.2}Sr{sub 1.8}CoMnO{sub 7}, LaSr{sub 2}CoMnO{sub 6} and La{sub 1.2}Sr{sub 1.8}CoMnO{sub 6} are synthesized and characterized.},
doi = {10.1016/j.jssc.2010.04.018},
url = {https://www.osti.gov/biblio/21421521}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 6,
volume = 183,
place = {United States},
year = {Tue Jun 15 00:00:00 EDT 2010},
month = {Tue Jun 15 00:00:00 EDT 2010}
}