中国物理B ›› 2018, Vol. 27 ›› Issue (4): 48401-048401.doi: 10.1088/1674-1056/27/4/048401

所属专题： SPECIAL TOPIC — Recent advances in thermoelectric materials and devices

• TOPIC REVIEW—Thermal and thermoelectric properties of nano materials • 上一篇    下一篇

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

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)   

  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
  • 收稿日期:2017-12-21 修回日期:2018-01-28 出版日期:2018-04-05 发布日期:2018-04-05
  • 通讯作者: Jun Wang, Jun Wang E-mail:wangjun@imut.edu.cn;shinbayaer@imut.edu.cn
  • 基金资助:
    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).

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. 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
  • Received:2017-12-21 Revised:2018-01-28 Online:2018-04-05 Published:2018-04-05
  • Contact: Jun Wang, Jun Wang E-mail:wangjun@imut.edu.cn;shinbayaer@imut.edu.cn
  • Supported by:
    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).

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摘要： 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.

关键词: thermoelectric materials, SrTiO3/LaNb-SrTiO3 composite, hydrothermal method, strontium titanate

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.

Key words: thermoelectric materials, SrTiO3/LaNb-SrTiO3 composite, hydrothermal method, strontium titanate

中图分类号:  (Thermoelectric, electrogasdynamic and other direct energy conversion)

  • 84.60.Rb
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)