High thermoelectric properties of P-SiGe/Sr0.9La0.1Ti0.9−xZrxNb0.1O3 composite

Abstract

SrTiO3 is a high temperature thermoelectric material with calcium titanite structure that is environmentally friendly and affordable, but the high thermal conductivity at high temperatures limits its development, so how to maintain high electrical properties while reducing thermal conductivity is the most important problem facing SrTiO3. SiGe and SrTiO3 are both thermoelectric materials in the intermediate and high temperature region and have a lot of commonalities, and it is likely to obtain high thermoelectric properties through the interfacial effect of both, however, there is not any study on the compound regulation of the two. Therefore, in this study, phosphorus (P)-doped SiGe was compounded with Zr, La and Nb co-doped SrTiO3. 3 mol.%SiGe(C)/97 mol.% Sr[Formula: see text]La[Formula: see text]Ti[Formula: see text]Zr[Formula: see text]Nb[Formula: see text]O3(Zr1Si3(C)) obtained by sintering under carbon reducing atmosphere shows a relatively large power factor of and low thermal conductivity of 2.88 Wm[Formula: see text]K[Formula: see text] at 1000 K, achieve a ZT value to 0.42 at 1000 K. This is at a high level in this study of SrTiO3 composite thermoelectric materials and provides a new idea for the subsequent study of composite modulation.