IMF2017

Thermoelectric (TE) power generator generally consists of p-type and n-type thermoelectric elements, which are connected thermally in parallel and electrically in series. There are not many options available among oxide-based materials at present to choose as n-type element in the thermoelectric module. Nb doped SrTiO₃ (SrTiO₃: Nb) has show lot of promises as an n-type thermoelectric material. Recently, authors have reported that molybdenum can be used to increase the electrical conductivity of SrTiO₃ perovskite. In the present work, we have doped Mo in place of Ti in SrTiO₃:15%Nb in anticipation of increasing its electrive conductivity which can pave way for attaining higher ZT values. Polycrystalline samples of SrTi_1-xMo_xO₃:15Nb (0 x 0.3) have been synthesized by solid-state reaction process. Sintering has been done at 1673-1773 K under reducing atmosphere. X-ray diffraction pattern has confirmed single phase solid solution. Scanning electron microscopy has confirmed dance microstructure. Seebeck coefficient and electrical conductivity have been measured from room temperature to 1173 K. Conductivity mechanism of these perovskites has been found to be governed by variable range hopping model.