Influence of multi-sintering on the thermoelectric properties of Bi2Sr2Co2Oy ceramics

摘要

Bi2Sr2Co2Oy ceramic samples have a structure similar to phonon glass electronic crystals, and their thermoelectric properties can be effectively adjusted through repeated grinding and sintering. The results show that multi-sintering can make their grain refined and increase their grain boundary, which will effectively increase density and phonon scattering. Finally, multi-sintering can reduce the resistivity and thermal conductivity, thus obviously improve thermoelectric figure of merit (ZT) of Bi2Sr2Co2Oy. The optimum ZT value of 0.26 is achieved at 923 K by the third sintered sample.