Na/Se掺杂p-型AgSbTe2化合物热电性能研究

doi:10.3724/SP.J.1077.2011.00680

无机材料学报 ›› 2011, Vol. 26 ›› Issue (7): 680-684.DOI: 10.3724/SP.J.1077.2011.00680

Na/Se掺杂p-型AgSbTe₂化合物热电性能研究

杜保立^1,2, 李涵¹, 唐新峰1

(1. 武汉理工大学材料复合新技术国家重点实验室, 武汉 430070; 2. 河南理工大学物理化学学院, 焦作 453000)

收稿日期:2010-09-20 修回日期:2010-12-12 出版日期:2011-07-20 网络出版日期:2011-06-20
作者简介:杜保立(1978-), 男, 博士研究生
基金资助:
国家973计划项目(2007CB607501); 中央高校基本科研业务费专项基金(2010-IV-046)

Enhanced Thermoelectric Performance in Na/Se Doped p-type AgSbTe₂ Compound

DU Bao-Li^{1, 2}, LI Han¹, TANG Xin-Feng¹

(1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China; 2. School of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 453000, China)

Received:2010-09-20 Revised:2010-12-12 Published:2011-07-20 Online:2011-06-20
Supported by:
National Basic Research Program of China (2007CB607501); Fundamental Research Funds for the Central Universities (2010-IV-046)

摘要/Abstract

摘要： 采用熔融-淬火-放电等离子烧结方法制备了两种不同掺杂方式的Na单掺和Na/Se共掺p型AgSbTe₂多晶块体材料(Ⅰ: 掺杂元素以过量形式添加AgNa_0.01SbTe₂, AgNa_0.01SbTe₂Se_0.04; Ⅱ: 掺杂元素以置换对应元素形式添加Ag_0.99Na_0.01SbTe₂, Ag_0.99Na_0.01SbTe_1.96Se_0.04). 研究了Na单掺、Na/Se共掺及不同掺杂方式对材料电、热输运性能的影响规律. 通过比较不同掺杂方式样品的电、热传输性能确定了最佳的Na/Se 掺杂方式: Na置换Ag, Se置换Te并结合适当的Se过量加入. 由于Na掺杂对Seebeck 系数的提高及Se掺杂对电导率和热导率的优化, Ag_0.99Na_0.01SbTe_1.96Se_0.04化合物ZT最大值在620 K达到1.4, 较未掺杂AgSbTe₂化合物提高约17%.

关键词: AgSbTe₂, 热电性能, Se, Na, 掺杂

Abstract: Two types of Na-doped and Na/Se co-doped polycrystalline, sintered samples of p-type AgSbTe₂ thermo- electric compounds were prepared from high purity elements by a melt-quench technique followed by spark plasma sintering (Ⅰ: with excess Na or Na/Se, AgNa_0.01SbTe₂, AgNa_0.01SbTe₂Se_0.04; Ⅱ: replacing corresponding elements by Na or Na/Se, Ag_0.99Na_0.01SbTe₂, Ag_0.99Na_0.01SbTe_1.96Se_0.04). The impacts of Na-doping, Na/Se co-doping and doping form on electrical and thermal transport properties were investigated. Meanwhile, by comparing the thermoelectric performance of samples with different kinds of doping form, the optimal doping method is obtained. That is Na replacing Ag, Se replacing Te with appropriate amount of excess Se. Due to the elevation of Seebeck coefficient by Na-doping and optimization of electrical and thermal conductivities by Se-doping, a maximum of ZT merit of 1.4 is achieved at 620 K for sample Ag_0.99Na_0.01SbTe_1.96Se_0.04, representing a 17% enhancement with respect to the undoped sample at the same temperature.

Key words: AgSbTe₂, thermoelectric property, Se, Na, doping

中图分类号:

TB34

杜保立, 李涵, 唐新峰. Na/Se掺杂p-型AgSbTe₂化合物热电性能研究[J]. 无机材料学报, 2011, 26(7): 680-684.

DU Bao-Li, LI Han, TANG Xin-Feng. Enhanced Thermoelectric Performance in Na/Se Doped p-type AgSbTe₂ Compound[J]. Journal of Inorganic Materials, 2011, 26(7): 680-684.

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Na/Se掺杂p-型AgSbTe₂化合物热电性能研究

Enhanced Thermoelectric Performance in Na/Se Doped p-type AgSbTe₂ Compound

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