Effects of Ce,Y,and Sm doping on the thermoelectric properties of Bi2Te3 alloy

• Published in: Progress in natural science Vol. 23; no. 4; pp. 408 - 412
• Main Authors: Wu, Fang, Song, Hongzhang, Jia, Jianfeng, Hu, Xing
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2013; School of Physical Engineering, Zhengzhou University, Zhengzhou 450052, China; Department of Physics, Henan Institute of Education, Zhengzhou 450053, China%School of Physical Engineering, Zhengzhou University, Zhengzhou 450052, China
• Subjects: doped; Elements; Elements doped; Figure; Figure of merit; merit; Morphologies; R0.2Bi1.8Te3; Elements doped; Morphologies; R0.2Bi1.8Te3; Figure of merit
• ISSN: 1002-0071
• DOI: 10.1016/j.pnsc.2013.06.007

Nanopowders of elements doped Bi2Te3thermoelectric alloy R0.2Bi1.8Te3(R Ce,Y and Sm)were synthesized by the hydrothermal method.The nanopowders were hot-pressed into pellets and their thermoelectric properties were investigated.The results show that Ce,Y,and Sm doping has signifcant effects on the morphologies of the synthesized nanopowders and thermoelectric properties.Among the doping elements,Ce doping is a superiority dopant.Although the electrical conductivity and Seebeck coeffcient are not improved much by Ce doping,the thermal conductivity is supressed greatly.As a result the fgure of merit(ZT) of Ce0.2Bi1.8Te3is improved and reaches 1.29 at 398 K,which is higher than the Bi2Te3ingots made by the traditional zone-melting method