High temperature thermoelectric characteristics of Ca0.9R0.1MnO3 (R=La,Pr,…,Yb)
作者： Yang Wang , Yu Sui , Wenhui Su
DOI: 10.1063/1.3003065
关键词: Materials science 、 Doping 、 Polaron 、 Manganite 、 Thermoelectric effect 、 Inorganic chemistry 、 Analytical chemistry 、 Electrical resistivity and conductivity 、 Oxide 、 Ion 、 Seebeck coefficient
摘要: Electron-doped perovskite manganite Ca0.9R0.1MnO3 (R=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb) polycrystalline samples were prepared and their transport thermoelectric properties studied from room temperature to 1000 K. The behavior for all the is adiabatic small polaron hopping mechanism below 600 K but changes metallic conductivity at higher temperature. Above K, more 3d electrons of Mn3+ ions will occupy eg orbitals, resulting in variation power values. For samples, only determined by carrier concentration, resistivity also rests with effective bandwidth. size matching between Ca2+ R3+ together heavier doping can improve performance evidently. Combining these two factors, Ca0.9Dy0.1MnO3 Ca0.9Yb0.1MnO3 reach ZT=0.2 suggesting that they be efficient high n-type oxide materials.
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