Synthesis and thermoelectric properties of p-type Ba_8Ga_(16)Zn_xGe_(30-x)type-l clathrates

Shukang Deng; Xinfeng Tang; Qingjie Zhang

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Synthesis and thermoelectric properties of p-type Ba_8Ga_(16)Zn_xGe_(30-x)type-l clathrates

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Zn-doping Ba_8Ga_(16)Zn_xGe_(30-x) (x=2A, 2.6, 2.8, 3.0, 3.2) clathrates with different Zn contents were synthesized by combining the solid-state reaction with the spark plasma sintering method. The effects of Zn content on thermoelectric properties were investigated. The results show that all specimens exhibit p-type conduction characteristics. The electrical conductivity, the room-temperature carrier mobility, and the thermal conductivity decrease with increasing Zn content for Zn-doped Ba_8Ga_(16)Zn_xGe_(30-x) compounds, while the room-temperature carrier concentration Np increases with increasing Zn content. The carrier scattering mechanism is mainly ionized impurity mechanism in the low-temperature range, (T < 200 K), and gradually changes to an acoustical mechanism with the rising temperature. In all p-type Ba_8Ga_(16)Zn_xGe_(30-x) compounds, Ba_8Ga_(16)Zn_(3.2)Ge_(26.8) exhibits the highest Seebeck coefficient with the value of 250 μV/K at 300 K and 307 μV/K around 700 K, respectively. The maximum ZT value of 0.38 is obtained at 790 K for Ba_8Ga_(16)Zn_(3.0)Ge_(27.0) .

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来源
《Journal of Applied Physics》 |2007年第4期|043702.1-043702.5|共9页
作者
Shukang Deng; Xinfeng Tang; Qingjie Zhang;
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作者单位

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology, Wuhan 430070, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类应用物理学;计量学;
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Synthesis and thermoelectric properties of p-type Ba_8Ga_(16)Zn_xGe_(30-x)type-l clathrates

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