Article (Scientific journals)
Effects of silicon addition on the electrical and magnetic properties of copper-doped (La,Ca)MnO3 compounds
Vertruyen, Bénédicte; Rulmont, André; Cloots, Rudi et al.
2004In Journal of Magnetism and Magnetic Materials, 268 (3), p. 364-373
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Keywords :
manganates; perovskite; electrical resistivity; grain boundaries
Abstract :
[en] In this paper we report about the electrical properties of La0.7Ca0.3MnO3 compounds substituted by copper on the manganese site and/or deliberately contaminated by SiO2 in the reactant mixture. Several phenomena have been observed and discussed. SiO2 addition leads to the formation of an apatite-like secondary phase that affects the electrical conduction through the percolation of the charge carriers. On the other hand, depending on the relative amounts of copper and silicon, the temperature dependence of the electrical resistivity can be noticeably modified: our results enable us to compare the effects of crystallographic vacancies on the A and B sites of the perovskite with the influence of the copper ions substituted on the manganese site. The most original result occurs for the compounds with a small ratio Si/Cu, which display double-peaked resistivity vs. temperature curves. (C) 2003 Elsevier B.V. All rights reserved.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Materials science & engineering
Physics
Author, co-author :
Vertruyen, Bénédicte  ;  Université de Liège - ULiège > Chimie inorganique structurale
Rulmont, André ;  Université de Liège - ULiège > Chimie inorganique structurale
Cloots, Rudi ;  Université de Liège - ULiège > Chimie inorganique structurale
Ausloos, Marcel ;  Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux
Fagnard, Jean-François  ;  Université de Liège - ULiège > Dép. d'électric.
Dorbolo, Stéphane  ;  Université de Liège - ULiège > Département de physique > Physique statistique
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Capteurs et systèmes de mesures électriques
Language :
English
Title :
Effects of silicon addition on the electrical and magnetic properties of copper-doped (La,Ca)MnO3 compounds
Publication date :
January 2004
Journal title :
Journal of Magnetism and Magnetic Materials
ISSN :
0304-8853
eISSN :
1873-4766
Publisher :
Elsevier Science Bv, Amsterdam, Netherlands
Volume :
268
Issue :
3
Pages :
364-373
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE]
Commentary :
Journal home page : http://www.elsevier.com/wps/find/journaldescription.cws_home/505704/description#description
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since 29 May 2009

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