Disorder scattering effect on the high-temperature lattice thermal conductivity of TiCoSb-based half-Heusler compounds

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  • Min Zhou
    Shanghai Institute of Ceramics State Key Laboratory of High Performance Ceramics and Superfine Microstructure, , Chinese Academy of Sciences, Shanghai 200050, China and Graduate School of Chinese Academy of Sciences, Shanghai 200050, China
  • Lidong Chen
    Shanghai Institute of Ceramics State Key Laboratory of High Performance Ceramics and Superfine Microstructure, , Chinese Academy of Sciences, Shanghai 200050, China
  • Wenqing Zhang
    Shanghai Institute of Ceramics State Key Laboratory of High Performance Ceramics and Superfine Microstructure, , Chinese Academy of Sciences, Shanghai 200050, China
  • Chude Feng
    Shanghai Institute of Ceramics State Key Laboratory of High Performance Ceramics and Superfine Microstructure, , Chinese Academy of Sciences, Shanghai 200050, China

Abstract

<jats:p>The lattice thermal conductivities of TiCoSb-based half-Heusler alloys are presented in the temperature range between 300 and 900K. A phenomenological model calculation of the high-temperature lattice thermal conductivities of these alloys was derived based on the Klemens–Callaway theory [Phys. Rev. 119, 507 (1960); ibid. 113, 1046 (1959)]. Good agreement was obtained between the calculated and the experimental data for TiCoSb, TiCo0.5Rh0.5Sb, and Ti0.5Zr0.5CoSb. Furthermore, the model predicts that simultaneously isoelectronic alloying on both Ti and Co sublattices could reduce the lattice thermal conductivity, and a κL value of 0.3W∕mK is predicted for Ti0.5Zr0.5Co0.5Rh0.5Sb at 900K.</jats:p>

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