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Title: Thermoelectric transport properties of diamond-like Cu{sub 1−x}Fe{sub 1+x}S{sub 2} tetrahedral compounds

Polycrystalline samples with the composition of Cu{sub 1−x}Fe{sub 1+x}S{sub 2} (x = 0, 0.01, 0.03, 0.05, 0.1) were synthesized by a melting-annealing-sintering process. X-ray powder diffraction reveals all the samples are phase pure. The backscattered electron image and X-ray map indicate that all elements are distributed homogeneously in the matrix. The measurements of Hall coefficient, electrical conductivity, and Seebeck coefficient show that Fe is an effective n-type dopant in CuFeS{sub 2}. The electron carrier concentration of Cu{sub 1−x}Fe{sub 1+x}S{sub 2} is tuned within a wide range leading to optimized power factors. The lattice phonons are also strongly scattered by the substitution of Fe for Cu, leading to reduced thermal conductivity. We use Debye approximation to model the low temperature lattice thermal conductivity. It is found that the large strain field fluctuation introduced by the disordered Fe ions generates extra strong phonon scatterings for lowered lattice thermal conductivity.
Authors:
;  [1] ;  [2] ;  [2] ; ; ;  [1] ;  [2] ; ;  [3]
  1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 (China)
  2. (China)
  3. Department of Materials Science, California Institute of Technology, Pasadena, California 91125 (United States)
Publication Date:
OSTI Identifier:
22402692
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; 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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; DIAMONDS; ELECTRIC CONDUCTIVITY; IRON IONS; PHONONS; POLYCRYSTALS; POWER FACTOR; SINTERING; THERMAL CONDUCTIVITY; X RADIATION; X-RAY DIFFRACTION