An effect of Fe₂O₃ additive on a seebeck coefficient and a power factor for SmCoO₃ perovskite system

SmCoO₃ system was investigated for their application to themoelectric materials. All specimens showed p-type semiconducting behavior and their electrical conductivity (a), Seebeck coefficient (S) and power factor were measured at high temperature. And the effect of dopant ions on their thermoelectrical properties were also investigated. Fe³⁺ ion doped into Co³⁺ site enhanced the Seebeck coefficient and decreased the electrical conductivity simultaneously. The maximum Seebeck coefficient value for 60% doping case reached to 780 μmV/K at 240°C. However Fe ³⁺ doped system cause an negative effect on power factor value. In case of the pure phase, the maximum Seebeck coefficient value reached to 290 μV/K at 240°C and the maximum electrical conductivity was obtained 748 1/ (ohm×cm) at 960°C. As a result, the maximum power factor was obtained 1.49×10^-4 W/mK² at 550°C.