Lattice thermal conductivity of skutterudite compounds

被引：0
作者：
Banashree Saikia
Priyanshu R. Borthakur
机构：
[1] Institute of Chartered Financial Analysts of India,Department of Science and Technology University
来源：
Indian Journal of Physics | 2010年 / 84卷
关键词：
Lattice thermal conductivity; normal process; relaxation time; dispersion curve; phonon Boltzmann equation;
D O I：
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学科分类号：
摘要：
A generalized expression is used on the basis of relaxation time approximation to facilitate calculation of lattice thermal conductivity of dielectric materials as well as skutterudite family consists of compounds of the form AB3. It is assumed that phonon scattering processes are independent and is represented by frequency dependent relaxation times. The contributions of normal three phonon scattering processes are included explicitly as redistribution of phonon momentum between two oscillation branches is considered. Magnitudes of relaxation times are estimated from the experimental data. The result for CoSb3 is in reasonably good agreement with the experimental result in the temperature range 1–1000°K. It is observed that redistribution of phonon momentum between two oscillation branches leads to a significant suppression of thermal conductivity maximum and it is observed that for unfilled skutterudite the main dominant mechanism at the thermal conductivity maximum is three phonon normal scattering process.
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页码：675 / 679
页数：4
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