Structures and Thermoelectric Properties of (GeTe)nBi2Te3

doi:10.15541/jim20200252

Abstract

Abstract:

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)₁₃Bi₂Te₃is 1.27, which is 16% higher than that of pristine GeTe.

Key words: GeTe, Bi₂Te₃doping, structure, thermoelectric property

CLC Number:

TB34/O482.6

YANG Xiao, SU Xianli, YAN Yonggao, TANG Xinfeng. Structures and Thermoelectric Properties of (GeTe)_nBi₂Te₃[J]. Journal of Inorganic Materials, 2021, 36(1): 75-80.

Figures/Tables 5

Fig. 1 Powder XRD patterns of (GeTe)nBi2Te3(n=10~14) compounds

Fig. 2 (a, e) Back-scattering electron (BSE) images and (b, f)Ge, (c, g)Te and (d, h) Bi elemental distributions of the polished surfaces for (GeTe)nBi2Te3 samples ((a-d) n=10, (e-h) n=14)

Fig. 3 Temperature dependence of (a) electrical conductivity, (b) Seebeck coefficient, (c) Pisarenko plots, (d) room temperature carrier mobility as a function of the carrier concentration for (GeTe)nBi2Te3

Fig. 4 Temperature dependence of the power factor for (GeTe)nBi2Te3 compounds with inset showing the corresponding relationship between carrier concentration and power factor at 723 K

Fig. 5 Temperature dependence of (a) total thermal conductivity κ, (b) lattice thermal conductivity κL and (c) figure of merit ZT for (GeTe)nBi2Te3

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Structures and Thermoelectric Properties of (GeTe)_nBi₂Te₃

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