Thermoelectric properties of La3+ and Ce3+ co doped CaMnO3 prepared by tape casting
Abstract The structural and thermoelectric transport properties of Ca0.9La0.1 xCexMnO3 d (x 0 0.1) prepared through tape casting process were investigated. The thermoelectric transport properties of CaMnO3 were optimized by the La3+ and Ce3+ co doping and tape casting process. The Ce3+ substitution substantially enhanced the dimensionless figure of merit (ZT) due to the increases in electrical conductivity and absolute Seebeck coefficient. Of the studied samples, Ca0.9La0.025Ce0.075MnO3 d had the maximum ZT (0.17) at 800 degC, and this value was 42% and 70% larger than those of singly doped Ca0.9La0.1MnO3 d (0.12) and Ca0.9Ce0.1MnO3 d (0.10) respectively. We demonstrate that both the La3+ and Ce3+ co doping and tape casting process are highly promising approaches in enhancing the high temperature thermoelectric transport properties of CaMnO3.