Effect of addition of titanium nitride on thermoelectric performance of yttrium-doped strontium titanate

Abstract

We examined the effect of addition of titanium nitride on thermoelectric performance of this material. The samples constructed of Y-doped SrTiO 3 and TiN were prepared by two steps of the solid-state reactions. SrTiO3 with cubic perovskite structure was formed in all samples. The highest electric conductivity was found for Sr0.9Y 0.1TiO3-0.1TiN, whereas the largest absolute value in Seebeck coefficient was found for Sr0.9Y0.1TiO 3. Lower thermal conductivity was found for Sr0.9Y 0.1TiO3-0.1TiN. The ZT was calculated from the electric conductivity, the Seebeck coefficient, and the thermal conductivity. A high performance was shown in Sr0.9Y0.1TiO3-0.1TiN, giving a high electric conductivity and a low thermal conductivity simultaneously. The highest value of ZT was obtained to be 0.26 at 1077K for this sample. © 2011 The Thermoelectrics Society of Japan.