Thermoelectric Properties of Double Half-Heusler Ti2MnNiSi2 Alloy

This paper presents a study of the effect of structural disorder on the thermoelectric properties of the double half-Heusler Ti2MnNiSi2 alloy. The study shows that the ordered structure of the material is almost a half-metallic ferromagnet, and the thermoelectric figure of merit, when doped with n-type carriers, reaches 0.38 at a temperature of 700 K and an electron concentration of 3 × 1022 cm–3. The high value of this thermoelectric effect can be attributed to the low thermal conductivity kL. At room temperature, the minimum value of kL is 2.27 W m–1 K–1 in a disordered system and 3.62 W m–1 K–1 in an ordered one.