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Materials (Basel). 2018 Feb 8;11(2). pii: E262. doi: 10.3390/ma11020262.

Effect of C and N Addition on Thermoelectric Properties of TiNiSn Half-Heusler Compounds.

Author information

1
Convergence R&D Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Korea. antiquer@kicet.re.kr.
2
Convergence R&D Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Korea. wskim@kicet.re.kr.
3
Energy Efficient Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Korea. whshin@kicet.re.kr.

Abstract

We investigated the thermoelectric properties of the ternary half-Heusler compound, TiNiSn, when introducing C and N. The addition of C or N to TiNiSn leads to an enhanced power factor and a decreasing lattice thermal conductivity by point defect phonon scattering. The thermoelectric performances of TiNiSn alloys are significantly improved by adding 1 at. % TiN, TiC, and figure of merit (ZT) values of 0.43 and 0.34, respectively, can be obtained at 723 K. This increase in thermoelectric performance is very helpful in the commercialization of thermoelectric power generation in the mid-temperature range.

KEYWORDS:

half-heusler; thermal conductivity; thermoelectric material

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