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
- CSIR Network of Institutes for Solar Energy, Division of Materials Physics and Engineering, CSIR National Physical Laboratory, Dr. Krishnan Marg, New Delhi 110012 (India)
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden (Germany)
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.
- OSTI ID:
- 22395734
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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