High-temperature Thermoelectric Properties of Cu-substituted Bi2Ba2Co2-xCuxOy Oxides

J Mater Sci Technol ›› 2011, Vol. 27 ›› Issue (6): 525-528.

• Mechanical and Functional Properties of Materials • Previous Articles Next Articles

High-temperature Thermoelectric Properties of Cu-substituted Bi₂Ba₂Co_2-xCu_xO_y Oxides

Haoshan Hao^1,2), Huizhi Yang¹⁾, Yongtao Liu²⁾, Xing Hu²⁾

1) Department of Mathematical and Physical Sciences, Henan Institute of Engineering, Zhengzhou 451191, China
2) Key Laboratory of Material Physics of Ministry of Education, Zhengzhou University, Zhengzhou 450052, China

Received:2010-11-03 Revised:2011-02-15 Online:2011-06-28 Published:2011-06-22
Contact: H.S. Hao
Supported by:
the Foundation for University Key Teacher of Henan Province, China (No. 2008136) and the Program for Innovative Research Team (in Science and Technology) in Henan Institute of Engineering (No. 2009IRTHNIE05).

Abstract

Abstract: Cu-substituted Bi₂Ba₂Co_2-xCu_xO_y (0.0≤x≤0.4) samples were prepared by conventional solid-state reaction method and the effect of Cu substitution on the microstructure and thermoelectric properties were investigated. The partial substitution of Cu for Co in Bi₂Ba₂Co_2-xCu_xO_y led to an increase in the electrical conductivity because of an increase in the hole concentration and grain size of sintered bodies. In addition, Cu substitution led to an increase in Seebeck coefficients while kept the thermal conductivity unchanged. The highest thermoelectric figure of merit (ZT value) was obtained in x=0.4 sample and the value was 1.5 times as large as that of Cu-free sample at 873 K.

Key words: Bi₂Ba₂Co₂O_y, Cu substitution, Thermoelectric properties

CLC Number:

O472+.7

Haoshan Hao, Huizhi Yang, Yongtao Liu, Xing Hu. High-temperature Thermoelectric Properties of Cu-substituted Bi₂Ba₂Co_2-xCu_xO_y Oxides[J]. J Mater Sci Technol, 2011, 27(6): 525-528.

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High-temperature Thermoelectric Properties of Cu-substituted Bi₂Ba₂Co_2-xCu_xO_y Oxides

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