The effect of Ti substitution at the Zr and Hf site on thermoelectric properties of Tix(ZrHf)0.99-xV0.01Ni0.9Pd0.1Sn0.99Sb0.01 half-Heusler alloy compounds was investigated by finding the electrical resistivity, Hall effect, Seebeck coefficient, thermal conductivity and using X-ray diffraction. It was shown that substitution of Ti for Zr and Hf leads to a major reduction in the thermal conductivity and an enhancement of the Seebeck coefficient. The observed maximum Seebeck coefficient, minimum electrical resistivity, and minimum thermal conductivity at about 820 K are -206 μV K-1, 0.71 mΩ cm, and 5.13 W m-1 K-1, respectively. In addition, the dimensionless figure of merit is about 0.92 at about 820 K with a Ti content at x = 0.3.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry