标题：High-temperature thermoelectric performance of Ca0.96Dy0.02RE0.02MnO3 ceramics (RE = Ho, Er, Tm)
作者：Zhu, Yuanhu; Wang, Chunlei; Su, Wenbin; Li, Jichao; Liu, Jian; Du, Yanling; Mei, Liangmo
作者机构：[Zhu, Yuanhu; Wang, Chunlei; Su, Wenbin; Li, Jichao; Liu, Jian; Du, Yanling; Mei, Liangmo] Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 2 更多
通讯作者地址：[Zhu, YH]Shandong Univ, Sch Phys, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
关键词：Sintering; Electrical properties; Thermal conductivity; Ceramics; Oxides
摘要：Perovskite-type Ca0.98DY0.02MnO3 (CDM) and Ca0.96Dy0.02RE0.02MnO3 (RE=Ho, Er, Tm) (marked as CDM-Ho, CDM-Er, CDM-Tm) ceramics were prepared by solid state reaction. Their thermoelectric properties were evaluated between 300 K and 1000 K. All the samples are single phase with an orthorhombic structure. The introduction of second doping elements for RE=Ho, Er, Tm lead to a larger carrier concentration. As a result, the resistivity decreases from 36.1 m Omega cm for CDM to 12.4 m Omega cm for CDM-Ho at 973 K, while absolute Seebeck coefficient decreases from -300 mu V/K for CDM to -196 mu V/K for CDM-Tm. The highest power factor is obtained 350 mu W/(K(2)m) at 923 K for Ca0.96Dy0.02Er0.02MnO3 sample. And also the introduction of second element contributes to lower thermal conductivity. The highest figure of merit 0.23 is obtained for RE=Ho, Er samples at 973 K, representing an improvement of about 109% compared with Ca0.98Dy0.02MnO3 sample. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.