Influence of Ag2Te Doping on the Thermoelectric Properties of p-type Bi0.5Sb1.5Te3 Bulk Alloys

doi:10.3724/SP.J.1077.2010.00583

Abstract

Abstract: (Ag₂Te)_x(Bi_0.5Sb_1.5Te₃)_1-x(x=0, 0.025, 0.05, 0.1) alloys were synthesized by “Melting-Ball Milling-Spark Plasma Sintering” method. Transport properties measurements indicate that the Ag₂Te-doping can affect the temperature dependence of thermoelectric properties of the samples significantly. Samples with Ag₂Te-doping have better thermoelectric performances in the temperature range from 450 K to 550 K. Appropriate amount of Ag₂Te can enhance the phonon scattering of the alloys effectively, which lead to the lower thermal conductivities for these samples. Over the entire temperature range, sample (Ag₂Te)_0.05(Bi_0.5Sb_1.5Te₃)_0.95 exhibits the lowest lattice thermal conductivities, ranging within 0.2-0.3 W/(m·K) from room temperature to 575 K. The maximum ZT value of 0.84 is obtained at 575 K for the sample (Ag₂Te)_0.05(Bi_0.5Sb_1.5Te₃)_0.95. Compared with the one without doping, the ZT value is increased by almost 20%.

Key words: BiSbTe alloy, lattice thermal conductivity, thermoelectric materials

CLC Number:

TB34

SHEN Jun-Jie, ZHU Tie-Jun, YU Cui, YANG Sheng-Hui, ZHAO Xin-Bing. Influence of Ag₂Te Doping on the Thermoelectric Properties of p-type Bi_0.5Sb_1.5Te₃ Bulk Alloys[J]. Journal of Inorganic Materials, 2010, 25(6): 583-587.

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Influence of Ag₂Te Doping on the Thermoelectric Properties of p-type Bi_0.5Sb_1.5Te₃ Bulk Alloys

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