Effects of silicon addition on the electrical and magnetic properties of copper-doped (La,Ca)MnO3 compounds

[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/Unit :

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 :

Pages :

364-373

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJJ-490H8N4-4&_user=532038&_coverDate=01%2F31%2F2004&_rdoc=14&_fmt=high&_orig=browse&_srch=doc-info(%23toc%235312%232004%23997319996%23470360%23FLA%23display%23Volume)&_cdi=5312&_sort=d&_docanchor=&view=c&_ct=22&_acct=C000026659&_version=1&_urlVersion=0&_userid=532038&md5=9862309975577600381acf0d99e35bf1

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique
DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie

Commentary :

Journal home page : http://www.elsevier.com/wps/find/journaldescription.cws_home/505704/description#description

Available on ORBi :

since 29 May 2009

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