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Chin. Phys. B, 2018, Vol. 27(4): 048401    DOI: 10.1088/1674-1056/27/4/048401
Special Issue: SPECIAL TOPIC — Recent advances in thermoelectric materials and devices
SPECIAL TOPIC—Recent advances in thermoelectric materials and devices Prev   Next  

Enhancement of thermoelectric properties of SrTiO3/LaNb-SrTiO3 composite by different doping levels

Ke-Xian Wang(王柯鲜)1, Jun Wang(王俊)1, Yan Li(李艳)2, Tao Zou(邹涛)3, Xiao-Huan Wang(王晓欢)1, Jian-Bo Li(李建波)1, Zheng Cao(曹正)1, Wen-Jing Shi(师文静)1, Xinba Yaer(新巴雅尔)1
1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia Autonomous Region, China;
2. School of Chemical Engineering, Kang Ba Shi Qu, Ordos, Ordos Institute of Technology, Ordos 017000, Inner Mongolia Autonomous Region, China;
3. Beijing Center for Physical & Chemical Analysis, No. 27 Xi Sanhuan Road, Haidian District, Beijing 100089, China
Abstract  Strontium titanate (STO) is an n-type oxide thermoelectric material, which has shown great prospects in recent years. The doping of La and Nb into STO can improve its power factor, whereas its thermal conductivity is still very high. Thus, in order to obtain a high thermoelectric figure-of-merit zT, it is very important to reduce its thermal conductivity. In this paper, using a combination of a hydrothermal method and a high-efficiency sintering method, we succeed in preparing a composite of pure STO and LaNb-doped STO, which simultaneously realizes lower thermal conductivity and higher Seebeck coefficient, therefore, the thermoelectric properties of STO are significantly improved. In the SrTiO3/LaNb-SrTiO3 bulk samples, the lowest thermal conductivity is 2.57 W·m-1·K-1 and the highest zT is 0.35 at 1000 K for the STO/La10Nb20-STO sample.
Keywords:  thermoelectric materials      SrTiO3/LaNb-SrTiO3 composite      hydrothermal method      strontium titanate  
Received:  21 December 2017      Revised:  28 January 2018      Accepted manuscript online: 
PACS:  84.60.Rb (Thermoelectric, electrogasdynamic and other direct energy conversion)  
  72.15.Jf (Thermoelectric and thermomagnetic effects)  
  77.84.Cg (PZT ceramics and other titanates)  
  81.20.-n (Methods of materials synthesis and materials processing)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61751404, 51702168, and 51665042), the Fund from the State Key Laboratory of New Ceramic and Fine Processing (Tsinghua University), China (Grant No. KF201608), the Fund from the Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, China (Grant No. 151004-K), and the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant Nos. 2016BS0507 and 2015MS0509).
Corresponding Authors:  Jun Wang, Jun Wang     E-mail:  wangjun@imut.edu.cn;shinbayaer@imut.edu.cn

Cite this article: 

Ke-Xian Wang(王柯鲜), Jun Wang(王俊), Yan Li(李艳), Tao Zou(邹涛), Xiao-Huan Wang(王晓欢), Jian-Bo Li(李建波), Zheng Cao(曹正), Wen-Jing Shi(师文静), Xinba Yaer(新巴雅尔) Enhancement of thermoelectric properties of SrTiO3/LaNb-SrTiO3 composite by different doping levels 2018 Chin. Phys. B 27 048401

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