Thermoelectric properties of Li-doped Sr_(0.7)Ba_(0.3)Nb_2O_(6-δ) ceramics  

作　　者：张亚翠 刘剑 李宜 陈宇飞 李吉超 苏文斌 周昱成 翟近泽 王腾 王春雷 

机构地区：[1]School of Physics, State Key Laboratory of Crystal Materials, Shandong University

出　　处：《Chinese Physics B》2017年第10期423-427,共5页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China(Grant No.2013CB632506);the National Natural Science Foundation of China(Grant Nos.51202132,51231007,and 11374186)

摘　　要：Thermoelectric properties of Li-doped Sr0.70Ba0.30Nb2O6-δ ceramics were investigated in the temperature range from 323 K to 1073 K. The electrical conductivity increases significantly after lithium interstitial doping. However, both of the magnitudes of Seebeck coefficient and electrical conductivity vary non-monotonically but synchronously with the doping contents, indicating that doped lithium ions may not be fully ionized and oxygen vacancy may also contribute to carriers. The lattice thermal conductivity increases firstly and then decreases as the doping content increases, which is affected by competing factors.Thermoelectric performance is enhanced by lithium interstitial doping due to the increase of the power factor and the thermoelectric figure of merit reaches maximum value （0.21 at 1073 K） in the sample Sr0.70Ba0.30Li0.10Nb2O6.Thermoelectric properties of Li-doped Sr0.70Ba0.30Nb2O6-δ ceramics were investigated in the temperature range from 323 K to 1073 K. The electrical conductivity increases significantly after lithium interstitial doping. However, both of the magnitudes of Seebeck coefficient and electrical conductivity vary non-monotonically but synchronously with the doping contents, indicating that doped lithium ions may not be fully ionized and oxygen vacancy may also contribute to carriers. The lattice thermal conductivity increases firstly and then decreases as the doping content increases, which is affected by competing factors.Thermoelectric performance is enhanced by lithium interstitial doping due to the increase of the power factor and the thermoelectric figure of merit reaches maximum value （0.21 at 1073 K） in the sample Sr0.70Ba0.30Li0.10Nb2O6.

关 键 词：Sr0.7Ba0.3Nb2O6-δ interstitial doping thermoelectric properties 

分 类 号：TQ174.12[化学工程—陶瓷工业]