Misra, D. K. and Rajput, A. and Bhardwaj, A. and Chauhan, N. S. and Singh, Sanjay (2015) Enhanced power factor and reduced thermal conductivity of a half-Heusler derivative Ti9Ni7Sn8: A bulk nanocomposite thermoelectric material. Applied Physics Letters, 106 (10). 103901-1-103901-5. ISSN 0003-6951

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We report a half-Heusler (HH) derivative Ti9Ni7Sn8 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 Ti6Sn5 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.

Item Type: Article
Subjects: Applied Physics/Condensed Matter
Depositing User: Dr. Rajpal Walke
Date Deposited: 22 Sep 2016 07:12
Last Modified: 22 Sep 2016 07:12
URI: http://npl.csircentral.net/id/eprint/1808

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