Title
Synthesis and characterization of <tex>$La_{1+x}Sr_{2-x}CoMnO_{7-\delta}$</tex> (x=0,0.2; <tex>$\delta$</tex>=0,1) Synthesis and characterization of <tex>$La_{1+x}Sr_{2-x}CoMnO_{7-\delta}$</tex> (x=0,0.2; <tex>$\delta$</tex>=0,1)
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
London ,
Subject
Chemistry
Source (journal)
Journal of solid state chemistry. - London
Volume/pages
183(2010) :6 , p. 1347-1353
ISSN
0022-4596
ISI
000278750100021
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The n=2 Ruddlesden-Popper phases LaSr(2)CoMnO(7) and La(1 2)Sr(1 8)CoMnO(7) have been synthesized by a sol-gel method The O6-type phases LaSr(2)CoMnO(6) and La(1 2)Sr(1 8)CoMnO(6) were produced by reduction of the 07 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(3+)/Mn(4+) and Co(2+)/Mn(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 (C) 2010 Elsevier Inc All rights reserved
E-info
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