微波热压优化分层微观结构BixSb2-xTe3合金的热电性能

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摘要通过机械合金化结合微波活化热压新技术(MAHP)制备分层结构的p型Bi_xSb_2-_xTe₃(x=0.30,0.35和0.40,质量分数)合金,研究Bi含量对Bi_xSb_2-_xTe₃合金组织与热电性能的影响。结果表明,合金中存在不规则纳米颗粒,为原位纳米结构,是由微波电弧效应引起的。随Bi含量增加,载流子浓度明显降低,使得电阻率和塞贝克系数增加。同时,由于不规则纳米颗粒减少,合金的晶格热导率增加。Bi_0.3Sb_1.7Te₃具有最大功率因子3.81 mW/(m·K²)和最小晶格热导率0.33 W/(m·K),从而在70 ℃时获得最大的无量纲热电优值1.23。本研究引入的MAHP技术具有明显提升Bi_xSb_2-_xTe₃合金热电性能的效果。

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	刘培海
	冯波
	胡晓明
	李如松
	张阳琳
	樊希安

关键词 ：微波热压, 微波电弧效应, Bi_xSb_2-_xTe₃合金, 分层微观结构, 热电性能

Abstract：The p-type Bi_xSb_2-xTe₃ alloys with hierarchical microstructures were prepared by mechanical alloying and a new sintering technique of microwave activated hot pressing (MAHP). The effects of Bi content on the microstructure and thermoelectric properties of Bi_xSb_2-_xTe₃ alloy were studied. The results show that there are irregular nanoparticles, which are in-situ nanostructures caused by microwave arc effect. With increasing Bi content, the electrical resistivity and Seebeck coefficient increase due to the obvious decrease of carrier concentration. At the same time, the lattice thermal conductivity increases due to the decrease in the amount of irregular nanograins. Bi_xSb_2-_xTe₃ has a maximum power factor of 3.81 mW/(m·K²) and a minimum lattice thermal conductivity of 0.33 W/(m·K), so as to obtain the maximum dimensionless figure of merit value of 1.23 at 70 ℃. The MAHP technique introduced in this work has achieved a significant improvement in the thermoelectric properties of the Bi_xSb_2-_xTe₃ alloy.

Key words： microwave hot pressing microwave arcing effect Bi_xSb_2-_xTe₃ alloy hierarchical microstructures thermoelectric property

收稿日期: 2019-12-13 出版日期: 2020-08-11

ZTFLH:

TG15

基金资助:国家自然科学基金资助项目(51674181)

通讯作者: 樊希安,教授,博士。电话：13628661586;E-mail: groupfxa@163.com

引用本文:

刘培海, 冯波, 胡晓明, 李如松, 张阳琳, 樊希安. 微波热压优化分层微观结构Bi_xSb_2-_xTe₃合金的热电性能[J]. 粉末冶金材料科学与工程, 2020, 25(3): 213-220.
LIU Peihai, FENG Bo, HU Xiaoming, LI Rusong, ZHANG Yanglin, FAN Xi'an. Thermoelectric properties of Bi_xSb_2-_xTe₃ alloy with layered microstructure optimized by microwave hot pressing. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 213-220.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I3/213

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