Electrical resistivity behavior of substituted perovskite manganates sintered at different temperatures

Temperature dependence of the electrical resistivity of La 1−xCa xMnO 3 (x = 0.2, 0.3) samples sintered at two different temperatures are compared to understand the origin of the double-maxima-type resistivity curves of some doped perovskite manganates reported in the literature. It is shown that co...

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Bibliographic Details
Published in:Materials research bulletin 1999-11, Vol.34 (14), p.2143-2149
Main Authors: Joy, P.A, Kumar, P.S.Anil, Date, S.K
Format: Article
Language:English
Subjects:
A. oxides
B. chemical synthesis
C. X-ray diffraction
CALCIUM OXIDES
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
D. electrical properties
D. magnetic properties
ELECTRIC CONDUCTIVITY
Electronic transport in condensed matter
Exact sciences and technology
LANTHANUM OXIDES
Low-field transport and mobility
piezoresistance
MANGANESE OXIDES
MATERIALS SCIENCE
PEROVSKITE
Physics
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
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Summary:Temperature dependence of the electrical resistivity of La 1−xCa xMnO 3 (x = 0.2, 0.3) samples sintered at two different temperatures are compared to understand the origin of the double-maxima-type resistivity curves of some doped perovskite manganates reported in the literature. It is shown that compositional inhomogeneity is responsible for the anomalous electrical properties of the substituted manganate samples processed at low temperatures.
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(00)00164-1