Abstract
The structural and thermoelectric transport properties of Ca0.9La0.1–xCexMnO3–δ (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–δ had the maximum ZT (0.17) at 800 °C, and this value was 42% and 70% larger than those of singly doped Ca0.9La0.1MnO3–δ (0.12) and Ca0.9Ce0.1MnO3–δ (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.
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