Structural and thermoelectric properties of n-type Sr1−xTixMnO3−δ perovskite system

A series of Sr1−xTixMnO3−δ (0.05 ≤ x ≤ 0.3) was fabricated by the solid-state reaction method. We studied the structural and thermoelectric properties of Sr1−xTixMnO3−δ, with respect to the partial substitution of Ti4+ for Sr2+. The sintered Sr1−xTixMnO3−δ crystallized in the hexagonal perovskite-type structure with a space group of P63/mmc. For x ≤ 0.1, the partial substitution of Ti4+ for Sr2+ led to increases in the electrical conductivity and the absolute value of the Seebeck coefficient, thus enhancing the power factor. The highest power factor (2.5 × 10−5 Wm−1K−2) was obtained for Sr0.9Ti0.1MnO3−δ at 800°C. The partial substitution of Ti4+ for Sr2+ in SrMnO3−δ led to a significant improvement in the thermoelectric properties.