标题：Influence of rare earth doping on thermoelectric properties of SrTiO3ceramics
作者：Liu, J. ;Wang, C.L. ;Li, Y. ;Su, W.B. ;Zhu, Y.H. ;Li, J.C. ;Mei, L.M.
作者机构：[Liu, J. ;Wang, C.L. ;Li, Y. ;Su, W.B. ;Zhu, Y.H. ;Li, J.C. ;Mei, L.M. ] School of Physics, State Key Laboratory of Crystal Materials, Shandong Univer 更多
来源：Journal of Applied Physics
摘要：Thermoelectric properties of SrTiO3ceramics, doped with different rare earth elements, were investigated in this work. It's found that the ionic radius of doping elements plays an important role on thermoelectric properties: SrTiO3ceramics doped with large rare earth ions (such as La, Nd, and Sm) exhibit large power factors, and those doped with small ions (such as Gd, Dy, Er, and Y) exhibit low thermal conductivities. Therefore, a simple approach for enhancing the thermoelectric performance of SrTiO3ceramics is proposed: mainly doped with large ions to obtain a large power factor and, simultaneously, slightly co-doped with small ions to obtain a low thermal conductivity. Based on this rule, Sr0.8La0.18Yb0.02TiO3ceramics were prepared, whose ZT value at 1 023 K reaches 0.31, increasing by a factor of 19% compared with the single-doped counterpart Sr0.8La0.2TiO3(ZT = 0.26). © 2013 AIP Publishing LLC.