Nb掺杂碲化铅合金的热电性能

doi:10.11901/1005.3093.2014.122

材料研究学报

2015, Vol. 29

Issue (2): 115-119 DOI: 10.11901/1005.3093.2014.122

本期目录 | 过刊浏览

Nb掺杂碲化铅合金的热电性能

赵杰^1,²,辛彩妮^1,²,韩叶茂^1,²,周敏¹(

),黄荣进¹,李来风¹

1. 航天低温推进剂技术国家重点实验室中国科学院理化技术研究所北京 100190
2. 中国科学院大学北京 100049

Thermoelectric Properties of Nb-doped Lead Telluride Alloys

Jie ZHAO^1,²,Caini XIN^1,²,Yemao HAN^1,²,Min ZHOU^1,^*(

),Rongjin HUANG¹,Laifeng LI¹

1. State Key Laboratory of Technologies in Space Cryogenic Propellants, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

引用本文:

赵杰,辛彩妮,韩叶茂,周敏,黄荣进,李来风. Nb掺杂碲化铅合金的热电性能[J]. 材料研究学报, 2015, 29(2): 115-119.
Jie ZHAO, Caini XIN, Yemao HAN, Min ZHOU, Rongjin HUANG, Laifeng LI. Thermoelectric Properties of Nb-doped Lead Telluride Alloys[J]. Chinese Journal of Materials Research, 2015, 29(2): 115-119.

全文: PDF(1189 KB) HTML

摘要:

用机械合金(MA)和放电等离子烧结(SPS)方法制备出Nb掺杂的Pb_1.1Te合金块体, 在323-673 K温区内测试其电阻率、Seebeck系数和热扩散系数, 并计算其热电优值。结果表明: 在Pb_1.1Te中掺杂Nb能有效提高材料的载流子浓度, 优化其电性能, 使Pb_1.03Nb_0.07Te的功率因子在523-673 K温区范围内超过20 mW/(cmK²)。同时, Nb的引入可增强声子散射, 降低晶格热导率, 从而得到较高的热电优值。样品Pb_1.03Nb_0.07Te在673 K时ZT值最大为1.27, 是基体材料Pb_1.1Te的2倍。

关键词 ：金属材料, Seebeck系数, 晶格热导率, n型PbTe合金

Abstract：

Bulk Nb-doped lead telluride Pb_1.1Te was prepared by using a combined process of mechanical alloying (MA) and spark plasma sintering (SPS). Then its transport properties such as electrical resistivity, Seebeck coefficient and thermal diffusion coefficient were measured in a temperature range from 323 K to 673 K. As a result, the doped Nb can effectively enhance the phonon scattering ability of the lead telluride Pb_1.1Te, and optimize its electrical performance as well. Large power factors of over 20 mW/(cm·K²) were obtained in a wide temperature range (523-623 K). In addition, the thermal conductivity decreased with the increasing Nb content, which may also be resulted from the increase of the phonon scattering ability, thereby an optimal ZT value may be found. A maximum ZT value of 1.27 was obtained for Pb_1.03Nb_0.07Te at 673 K, which was twice as high as that for the un-doped Pb_1.1Te.

Key words： metallic materials Seebeck coefficient lattice thermal conductivity n-type PbTe alloys

收稿日期: 2014-03-17

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图1 样品Pb1.1-xNbxTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08)的XRD谱

图2 样品Pb1.1Te和Pb1.03Nb0.07Te的断口形貌

图3 样品Pb1.1-xNbxTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08)的电阻率、Seebeck系数以及功率因子与温度的关系(图a, b中的★代表已报道的纯PbTe[18]在323 K时的电阻率和Seebeck系数

图4 样品Pb1.1-xNbxTe在300 K霍尔迁移率与载流子浓度的关系

图5 Pb1.1-xNbxTe的总热导率κ和晶格热导率κl与温度的关系

图6 样品Pb1.1-xNbxTe (x=0, 0.02, 0.04, 0.06, 0.07, 0.08)的ZT值与温度的关系

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