Abstract
The air synthesized samples Ca1–xBixMnO3–δ, where x = 0.05, 0.10 and 0.15, show the formation of fully oxidized solid solution, δ = 0, with the orthorhombic structure (S G Pnma). It is shown that electrical properties at temperatures below 700 K are mostly governed by the charge disproportionation and local Jahn–Teller distortions of octahedral oxygen environment of Mn3+ cations. The bismuth doping strongly affects the disproportionation enthalpy, charge carriers concentration and conductivity. The metallic-like temperature dependencies of electrical conductivity and thermopower are interpreted within frameworks of a small polaron mechanism of electron transport. The maximum power factor 250 μW·K–2·m–1 is observed in Ca0.85Bi0.15MnO3–δ at 1120 K.
Published Version
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