Thermal Diffusivity and Conductivity of La0.7Ca0.3-xSrxMnO3 (x=0 to 0.10)

Alwi, Hasan A.; Ewe, Lay S.; Ibrahim, Zahari; Ibrahim, Noor B.; Abd-Shukor, Roslan

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Paper Title:

Thermal Diffusivity and Conductivity of La_0.7Ca_0.3-xSr_xMnO₃ (x=0 to 0.10)

Periodical	Advanced Materials Research (Volume 501)
Main Theme	Solid State Science and Technology XXVI
Edited by	R. Abd-Shukor, R. Awang, M. Deraman, M. M. Kamisah & R. Shamsudin
Pages	319-323
DOI	10.4028/www.scientific.net/AMR.501.319
Citation	Hasan A. Alwi et al., 2012, Advanced Materials Research, 501, 319
Online since	April, 2012
Authors	Hasan A. Alwi, Lay S. Ewe, Zahari Ibrahim, Noor B. Ibrahim, Roslan Abd-Shukor
Keywords	Manganite, Microstructure, Thermal Diffusivity
Price	US$ 28,-

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Abstract

We report the room temperature thermal conductivity κ and thermal diffusivity α of polycrystalline La0.7Ca0.3-xSrxMnO3 for x = 0 to 0.1. The samples were prepared by heating at 1220 and 1320oC. The insulator-metal transition temperature, TIM and thermal diffusivity increased with Sr content. Phonon was the dominant contributor to thermal conductivity and the electronic contribution was less than 1%. Enhancement of electrical conductivity σ and thermal diffusivity for x ≥ 0.08 was observed in both series of samples. The grain size of the samples (28 to 46 µm) does not show any affect on the thermal and electrical properties.