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Title: Lattice thermal conductivity of nanograined half-Heusler solid solutions

We report a phenomenological model of atomic weight, lattice constant, temperature, and grain size to calculate the high-temperature lattice thermal conductivity of nanograined solid solutions. The theoretical treatment developed here is reasonably consistent with the experimental results of n-type MNiSn and p-type MCoSb alloys, where M is the combination of Hf, Zr, and Ti. For disordered half-Heusler alloys with moderated grain sizes, we predict that the reduction in lattice thermal conductivity due to grain boundary scattering is independent of the scattering parameter, which characterizes the phonon scattering cross section of point defects. In addition, the lattice thermal conductivity falls off with temperature as T{sup –1∕2} around the Debye temperature.
Authors:
; ; ;  [1]
  1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China)
Publication Date:
OSTI Identifier:
22300217
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIMONY ALLOYS; COBALT ALLOYS; CROSS SECTIONS; DEBYE TEMPERATURE; GRAIN BOUNDARIES; GRAIN SIZE; HAFNIUM ALLOYS; HEUSLER ALLOYS; LATTICE PARAMETERS; MASS NUMBER; NICKEL ALLOYS; POINT DEFECTS; REDUCTION; SCATTERING; SIMULATION; SOLID SOLUTIONS; THERMAL CONDUCTIVITY; TIN ALLOYS; TITANIUM ALLOYS; ZIRCONIUM ALLOYS