Materials of bismuth telluride and antimony solid solution with graphene additives obtained by hot pressing

Thermoelectric properties of samples of a Bi0,5Sb1,5Te3 solid solution of the p-type conductivity obtained by hot pressing powders prepared by melt spinning with graphene plates have been investigated. The microstructure and fractograms of chips of the samples were studied using optical and scanning electron microscopy. Thermoelectric parameters were measured at room temperature: the Seebeck coefficient, electrical conductivity and thermal conductivity. Thermal conductivity was measured in the temperature range of 200 – 500 K, the Seebeck coefficient and electrical conductivity were measured in the temperature range of 100 – 300 K. The lattice component of thermal conductivity and the thermoelectric figure of merit ZT are calculated. The influence of various conditions for obtaining hot-pressed samples on their thermoelectric properties is considered. The properties of hot-pressed samples are compared with those of materials obtained by spark plasma sintering (SPS).