Effect of Addition of Titanium Nitride on Thermoelectric Performance of Yttrium-Doped Strontium Titanate

抄録

We examined the effect of addition of titanium nitride on thermoelectric performance of this material. The samples constructed of Y-doped SrTiO₃ 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 Sr_0.9Y_0.1TiO₃-0.1TiN, whereas the largest absolute value in Seebeck coefficient was found for Sr_0.9Y_0.1TiO₃. Lower thermal conductivity was found for Sr_0.9Y_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 Sr_0.9Y_0.1TiO₃-0.1TiN, giving a high electric conductivity and a low thermal conductivity simultaneously. The highest value of ZT was obtained to be 0.26 at 1077 K for this sample.