标题：Enhancement of Thermoelectric Performance of Sr1-xTi0.8Nb0.2O3 Ceramics by Introducing Sr Vacancies
作者：Chen, Yufei; Liu, Jian; Li, Yi; Zhang, Xinmiao; Wang, Xuejin; Su, Wenbin; Li, Jichao; Wang, Chunlei
作者机构：[Chen, Yufei; Liu, Jian; Li, Yi; Zhang, Xinmiao; Wang, Xuejin; Su, Wenbin; Li, Jichao; Wang, Chunlei] Shandong Univ, Sch Phys, 27 Shandananlu, Jinan 2 更多
通讯作者：Liu, Jian;Liu, J
通讯作者地址：[Liu, J]Shandong Univ, Sch Phys, 27 Shandananlu, Jinan 250100, Peoples R China.
来源：JOURNAL OF ELECTRONIC MATERIALS
关键词：SrTiO3 ceramics; thermoelectric properties; Sr vacancies
摘要：Donor-substituted strontium titanate is known as one of the best high-performance n-type oxide thermoelectric materials. In this work, Sr-deficient Sr1-xTi0.8Nb0.2O3 ceramics (x=0, 0.01, 0.02, 0.03 and 0.04) were synthesized by solid state reaction, and the microstructural and thermoelectric properties were investigated to clarify the effects of Sr vacancies. By introducing Sr vacancies, the absolute Seebeck coefficient and electrical conductivity are enhanced simultaneously as compared with those of the sample without Sr vacancy, and thus the values of power factor are improved obviously. Although thermal conductivity increases after introducing Sr vacancies, thermoelectric performance of Sr1-xTi0.8Nb0.2O3 ceramic is enhanced notably because of the significantly enhanced power factor, and the figure of merit zT at 1073K increases from 0.017 (of the sample x=0) to 0.236 (of the sample x=0.03).