Thermoelectric properties of CoTiSb based compounds

Abstract

Several CoTiSb based compounds were synthesized and investigated on their thermoelectric properties. The aim was to improve the thermoelectric properties of CoTiSb by the systematic substitution of atoms or the introduction of additional Co into the vacant sublattice. The solid solutions Co1+xTiSb, Co1−yCuyTiSb and CoTiSb1−zBiz were synthesized. X-ray diffraction was used to investigate the crystal structure. The resistivity, the Seebeck coefficient and the thermal conductivity were determined for all compounds in the temperature range from 2 to 400 K. The highest figure of merit for each solid solution is presented. We were able to improve the figure of merit by a factor of approximately seven.