Investigation of the thermoelectric properties of the series TiCo_1-xNi_xSn_xSb_1-x

Joachim Barth (1) , Leslie Schoop (1) , Andrei Gloskovskii (1) , Andrey Shkabko (2) , Anke Weidenkaff (2) , Claudia Felser (1)

1 Institut für Anorganische und Analytische Chemie
2 Solid State Chemistry and Catalysis

The effect of the simultaneous substitution of Co by Ni and Sb by Sn in the solid solution TiCo_1-xNi_xSn_xSb_1-x was systematically investigated. The number of valence electrons does not change by this substitution and therefore the resistivity stays semimetallic or semiconducting. The series was synthesized by arcmelting and the thermoelectric properties were determined. It was found out that the substitution of Co and Sb by Ni and Sn reduces the thermal conductivity to 2 Wm^-1 K^-1 at 400 K. The reduction is caused by Ti rich prolate micro structures that were found by energy dispersive X­ray spectroscopy investigations. The Seebeck coefficient and the resistivity increase with increasing amounts of Co and Sb. The highest Power factor was found for the composition TiCo_0.8Ni_0.2Sn_0.8Sb_0.2 at 900 K with the value of 9.2 µWcm^-1K^-1.

Mots clés: Physical Sciences

Joachim Barth, Leslie Schoop, Andrei Gloskovskii, Andrey Shkabko, Anke Weidenkaff, et al.. Investigation of the thermoelectric properties of the series TiCo_1-xNi_xSn_xSb_1-x. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2009, 636 (1), pp.132. ⟨10.1002/zaac.200900349⟩. ⟨hal-00529570⟩