Article (Scientific journals)
Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites
Mucha, J.; Vertruyen, Bénédicte; Misiorek, H. et al.
2009In Journal of Applied Physics, 105 (6), p. 063501
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Keywords :
calcium compounds; colossal magnetoresistance; composite materials; grain size; interface magnetism; lanthanum compounds; manganese compounds; phonons; porosity; thermal conductivity; twinning
Abstract :
[en] We report the temperature dependence of the thermal conductivity kappa(T) of bulk polycrystalline composite samples containing a magnetoresistive manganite (La0.7Ca0.3MnO3) and an electrically insulating phase (Mn3O4). The sample porosity is shown to be a significant parameter affecting the experimental data: after porosity correction the curves display the characteristics of an ideal composite. A fit of the kappa(T) curves at low temperature using the Debye model enables the mean free path of phonons scattered on "boundaries" to be determined. The values are on the order of the grain size but are influenced by the grain arrangement and the presence of twins.
Research center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Materials science & engineering
Physics
Chemistry
Author, co-author :
Mucha, J.;  Institute of Low Temperature and Structural Research, Wroclaw
Vertruyen, Bénédicte  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Misiorek, H.;  Institute of Low Temperature and Structural Research, Wroclaw
Ausloos, Marcel ;  Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux - S.U.P.R.A.S.
Durczewski, K.;  Institute of Low Temperature and Structure Research, Wroclaw
Vanderbemden, Philippe  ;  Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques
Language :
English
Title :
Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites
Publication date :
2009
Journal title :
Journal of Applied Physics
ISSN :
0021-8979
eISSN :
1089-7550
Publisher :
American Institute of Physics, Melville, United States - New York
Volume :
105
Issue :
6
Pages :
063501
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
PAN - Polish Academy of Sciences [PL]
Commentary :
Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 105, 063501 (2009) and may be found at http://link.aip.org/link/?JAPIAU/105/063501/1.
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