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Title: Enhanced power factor and reduced thermal conductivity of a half-Heusler derivative Ti{sub 9}Ni{sub 7}Sn{sub 8}: A bulk nanocomposite thermoelectric material

We report a half-Heusler (HH) derivative Ti{sub 9}Ni{sub 7}Sn{sub 8} with VEC = 17.25 to investigate the structural changes for the optimization of high thermoelectric performance. The structural analysis reveals that the resulting material is a nanocomposite of HH and full-Heusler with traces of Ti{sub 6}Sn{sub 5} type-phase. Interestingly, present nanocomposite exhibits a significant decrease in thermal conductivity due to phonon scattering and improvement in the power factor due to combined effect of nanoinclusion-induced electron injection and electron scattering at interfaces, leading to a boost in the ZT value to 0.32 at 773 K, which is 60% higher than its bulk counterpart HH TiNiSn.
Authors:
; ; ;  [1] ;  [2]
  1. CSIR Network of Institutes for Solar Energy, Division of Materials Physics and Engineering, CSIR National Physical Laboratory, Dr. Krishnan Marg, New Delhi 110012 (India)
  2. Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden (Germany)
Publication Date:
OSTI Identifier:
22395734
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 10; Other Information: (c) 2015 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; ELECTRONS; HEUSLER ALLOYS; INTERFACES; NANOCOMPOSITES; NICKEL ALLOYS; OPTIMIZATION; PERFORMANCE; PHONONS; POWER FACTOR; SCATTERING; THERMAL CONDUCTIVITY; THERMOELECTRIC MATERIALS; TIN ALLOYS; TITANIUM ALLOYS