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过量Zn对β-Zn4Sb3热电性能影响的研究
引用本文:祁 琼,唐新峰,熊 聪,赵文俞,张清杰.过量Zn对β-Zn4Sb3热电性能影响的研究[J].物理学报,2006,55(10):5539-5544.
作者姓名:祁 琼  唐新峰  熊 聪  赵文俞  张清杰
作者单位:武汉理工大学材料复合新技术国家重点实验室,武汉 430070
基金项目:国家自然科学基金重大国际合作项目(批准号:50310353)和国家自然科学基金(批准号:50372049)资助的课题.
摘    要:采用真空熔融缓冷方法制备了单相β-Zn4Sb3以及含有过量Zn的β-Zn4Sb3块体热电材料.在300—700K的温度范围内测试了材料的电导率、Seebeck系数和热导率,研究了β-Zn4Sb3化合物中过量Zn的分布状态及其对材料热电性能的影响规律.结果表明:过量的Zn作为第二相较均匀的分布在β-Zn4Sb3的晶界上,随着Zn含量增加,材料电导率和热导率上升,Seebeck系数下降,Zn第二相的引入能有效提高材料的功率因子,Zn过量2at%的材料在700K时其ZT值达到1.10. 关键词: 4Sb3')" href="#">β-Zn4Sb3 电导率 Seebeck系数

关 键 词:β-Zn4Sb3  电导率  Seebeck系数
收稿时间:1/6/2006 12:00:00 AM
修稿时间:2006-01-062006-03-26

Effects of excessive Zn on the thermoelectric properties of β-Zn4Sb3
Qi Qiong,Tang Xin-Feng,Xiong Cong,Zhao Wen-Yu and Zhang Qing-Jie.Effects of excessive Zn on the thermoelectric properties of β-Zn4Sb3[J].Acta Physica Sinica,2006,55(10):5539-5544.
Authors:Qi Qiong  Tang Xin-Feng  Xiong Cong  Zhao Wen-Yu and Zhang Qing-Jie
Institution:State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhanm University of Technology, Wuhan 430070, China
Abstract:Single-phase β-Zn4Sb3 bulk sample and several samples based on β-Zn4Sb3 with different amounts of Zn were produced by melting in an evacuated quartz ampoule followed by slow cooling and their thermoelectric properties were investigated at 300 to 700K. The distribution of Zn in the samples was observed and the effects of excess of Zn on thermoelectric properties of β-Zn4Sb3 compound were investigated systematically. With the amount of Zn increasing, electrical and thermal conductivities of the sample increase, and the Seebeck coefficient declines. The excess of Zn leads to an obvious improvement to the power factor of the β-Zn4Sb3 based materials. The ZTmax of the sample is 1.10 at 700K when the amount of excessive Zn is 2at%.
Keywords:β-Zn4Sb3  electrical conductivity  Seebeck coefficient
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