Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (1): 75-80.DOI: 10.15541/jim20200252

Special Issue: 能源材料论文精选(2021) 【虚拟专辑】热电材料(2020~2021)

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Structures and Thermoelectric Properties of (GeTe)nBi2Te3

YANG Xiao,SU Xianli,YAN Yonggao,TANG Xinfeng()   

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2020-05-12 Revised:2020-06-13 Published:2021-01-20 Online:2020-07-10
  • About author:YANG Xiao(1995-), male, Master candidate. E-mail: <email>
  • Supported by:
    National Key R&D Program of China(2019YFA0704900)


In general, (GeTe)n(Bi2Te3)m compounds in GeTe-Bi2Te3 pseudo-binary system possess a relatively low thermal conductivity, however, the thermoelectric properties of these compounds have not been evaluated systematically. In this study, a series of single-phase (GeTe)nBi2Te3 (n=10, 11, 12, 13, 14) compounds were prepared by a melting-quenching-annealing process combined with spark plasma sintering. The phase compositions and thermoelectrical properties of these samples were characterized. It is found that doping with Bi2Te3 intensifies the phonon scattering and significantly reduces the lattice thermal conductivities of these samples, producing a low total thermal conductivity of 1.63 W?m -1?K -1 at 723 K for (GeTe)13Bi2Te3 compound. Moreover, the effective mass of these compounds is enhanced through adjustment of the relative amount of Bi2Te3 and GeTe. Therefore, the Seebeck coefficient and power factor of these samples remain superior even at high carrier concentration. At 723 K, the maximum power factor of (GeTe)13Bi2Te3 compound is 2.88×10 -3 W?m -1?K -2 and the maximum ZT of (GeTe)13Bi2Te3 is 1.27, which is 16% higher than that of pristine GeTe.

Key words: GeTe, Bi2Te3 doping, structure, thermoelectric property

CLC Number: