Ag2Te掺杂对p型Bi0.5Sb1.5Te3块状合金热电性能的影响

doi:10.3724/SP.J.1077.2010.00583

无机材料学报 ›› 2010, Vol. 25 ›› Issue (6): 583-587.DOI: 10.3724/SP.J.1077.2010.00583

Ag₂Te掺杂对p型Bi_0.5Sb_1.5Te₃块状合金热电性能的影响

沈俊杰, 朱铁军, 蔚翠, 杨胜辉, 赵新兵

(浙江大学材料系硅材料国家重点实验室, 杭州 310027)

收稿日期:2009-10-14 修回日期:2009-12-24 出版日期:2010-06-20 网络出版日期:2010-05-12
基金资助:
国家基础研究项目(2007CB607502); 国家“863”研究计划(2007AA03Z234); 国家自然科学基金(50731006);教育部博士点基金(20060335126)

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

SHEN Jun-Jie, ZHU Tie-Jun, YU Cui, YANG Sheng-Hui, ZHAO Xin-Bing

(State key laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)

Received:2009-10-14 Revised:2009-12-24 Published:2010-06-20 Online:2010-05-12

摘要/Abstract

摘要： 采用真空熔炼、机械球磨及放电等离子烧结技术 (SPS) 制备得到了(Ag₂Te)x(Bi_0.5Sb_1.5Te₃)_1-x (x= 0, 0.025, 0.05, 0.1) 系列样品, 性能测试表明, Ag₂Te的掺入可以显著改变材料的热电性能变化趋势, 掺杂样品在温度为450~550 K范围内具有较未掺杂样品更优的热电性能. 适当量的Ag2Te掺入能够有效地提高材料的声子散射, 降低材料的热导率. 在测试温度范围内, (Ag₂Te)_0.05(Bi_0.5Sb_1.5Te₃)_0.95具有最低的晶格热导, 室温至575 K范围内保持在0.2 ~ 0.3 W/(m·K)之间, 在575 K时, (Ag₂Te)_0.05(Bi_0.5Sb_1.5Te₃)_0.95试样具有最大热电优值ZT = 0.84, 相较于未掺杂样品提高了约20%.

关键词: 铋锑碲合金, 晶格热导率, 热电材料

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

中图分类号:

TB34

沈俊杰, 朱铁军, 蔚翠, 杨胜辉, 赵新兵. Ag₂Te掺杂对p型Bi_0.5Sb_1.5Te₃块状合金热电性能的影响[J]. 无机材料学报, 2010, 25(6): 583-587.

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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Ag₂Te掺杂对p型Bi_0.5Sb_1.5Te₃块状合金热电性能的影响

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

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