Phase relation and thermoelectric property of Ca_1-xBi_xMn_1-yNi_yO₃ (0 ≤ x, y ≤ 0.1)

We established a Ca1-xBi xMn1-yNi yO3 (0 ≤ x, y ≤ 0.1) powder library using a combinatorial system based on the electrostatic spray deposition method. Single phase perovskite-type structures were identified in all of the powders. To measure electrical conductivity, the powder library was subjected to high-pressure (200 MPa) and heat-treated at 950°C for 1 hour in an oxygen atmosphere. As a representative example, the electrical conductivity of 5%-Bi-substituted CaMnO3-δ showed a higher value (63 S·cm^-1) than an unsubstituted powder (13 S·cm^-1). The improved electrical conductivity, on the other hand, was still very far from the ideal result (167 S·cm^-1).