Enhancement of Thermoelectric Performance of Sr0.9Ba0.1Ti0.8Nb0.2O3 Ceramics by A-Site Cation Nonstoichiometry  

作　　者：张鑫 刘剑 李宜 苏文斌 李吉超 祝元虎 李茂奎 王春明 王春雷 

机构地区：[1]School of Physics, State Key Laboratory of CrystM Materials, Shandong University, Jinan 250100 [2]Taishan College, Shandong University, Jinan 250100

出　　处：《Chinese Physics Letters》2015年第3期113-116,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant No 2013CB632506;the National Natural Science Foundation of China under Grant Nos 51202132,51002087 and 11374186;the Independent Innovation Foundation of Shandong University under Grant No IIFSDU 2012TS028

摘　　要：Sr0.9Ba0.1Ti0.8Nb0.2O3 ceramics （x=0, 0.01, 0.02 and 0.05） are prepared by solid state reaction, whose thermoelectric properties are investigated from 323K to 1073K. By introducing A-site nonstoichiometry, the absolute Seebeck coefficient is enhanced, while the electrical resistivity is surprisingly reduced due to the significantly enhanced carrier mobility. These results are dramatic in thermoelectric materials, effectively enhancing the power factor. Moreover, the thermal conductivity is reduced, thus the thermoelectric performance of Sr0.9Ba0.1Ti0.8Nb0.2O3 ceramic is significantly enhanced by A-site nonstoiehiometry.Sr0.9Ba0.1Ti0.8Nb0.2O3 ceramics （x=0, 0.01, 0.02 and 0.05） are prepared by solid state reaction, whose thermoelectric properties are investigated from 323K to 1073K. By introducing A-site nonstoichiometry, the absolute Seebeck coefficient is enhanced, while the electrical resistivity is surprisingly reduced due to the significantly enhanced carrier mobility. These results are dramatic in thermoelectric materials, effectively enhancing the power factor. Moreover, the thermal conductivity is reduced, thus the thermoelectric performance of Sr0.9Ba0.1Ti0.8Nb0.2O3 ceramic is significantly enhanced by A-site nonstoiehiometry.

关 键 词：Ba Nb O3 Ceramics by A-Site Cation Nonstoichiometry Ti 

分 类 号：TQ174.7[化学工程—陶瓷工业]