High temperature thermoelectric properties of Ca1−x Bi x Mn1−y V y O3−δ (0≤x=y≤0.08)

Abstract: CaMnO3−δ with complex additives Bi2O3–V 2O5 were prepared by the solid-state reaction. The crystal structures of the Ca1−x Bi x Mn1−y V y O3−δ (0≤x=y≤0.08) solid solutions were determined by means of the powder X-ray diffraction (XRD) using Rietan 2000 program and the high temperature thermoelectric properties were also investigated. Perovskite-type Ca1−x Bi x Mn1−y V y O3−δ solid solutions are n-type semiconductors. The lattice parameters increase with increasing dopant level. The high temperature thermoelectric properties are improved due to Bi2O3–V 2O5 simultaneous doping. A maximum ZT value reaches to 0.21 for electron-doped Ca0.96Bi0.04Mn0.96V 0.04O3−δ at 1050 K, which is about twice as high as that of CaMnO3−δ. The thermal shock resistance at temperatures between 20 and 450 ∘C is also highly improved. [Copyright &y& Elsevier]