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

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.

• Periodical: Advanced Materials Research (Volume 501)
• Pages: 319-323
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.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

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