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Zn掺杂n型笼合物Ba8Ga16-2xZnxGe30+x的热电传输特性

熊 聪 邓书康 唐新峰 祁 琼 张清杰

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Zn掺杂n型笼合物Ba8Ga16-2xZnxGe30+x的热电传输特性

熊 聪, 邓书康, 唐新峰, 祁 琼, 张清杰

Thermoelectric transport properties of Zn-doped n-type Ba8Ga16-2xZnxGe30+x clathrates

Xiong Cong, Deng Shu-Kang, Tang Xin-Feng, Qi Qiong, Zhang Qing-Jie
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  • 用高温熔融结合放电等离子烧结法制备了Zn掺杂单相n型Ba8Ga16-2xZnxGe30+x笼合物,探索了Zn对Ga的取代对其热电传输特性的影响规律.研究结果表明,n型Ba8Ga16-2xZnxGe30+x化合物的电导率随着x的增加逐渐增
    The single-phase Zn-doped n-type Ba8Ga16-2xZnxGe30+x clathrates were prepared by melting reaction method combined with spark plasma sintering (SPS). Influences of substituting Zn for Ga on the thermoelectric transport properties of the compounds were investigated. Research results indicate that the electrical conductivity of n-type Ba8Ga16-2xZnxGe30+x compounds increases gradually with the increasing of Zn substitution fraction x. The Seebeck coefficient decreases gradually with the increasing of x. When Zn replaces Ga entirely, the electrical conductivity of Ba8Zn8Ge38 compound drops rapidly and its Seebeck coefficient increases suddenly. Zn substitution fraction x dependence of the thermal conductivity and lattice thermal conductivity are similar in the temperature range from 300 to 1000 K.When xx,lattice thermal conductivity decreases gradually. When x>4, with the increase of x,lattice thermal conductivity increases gradually.In all n_type Ba8Ga16-2xZnxGe30+x clathrates, Ba8Ga8Zn4Ge34 compound has the greatest ZT value, and its maximal ZT value reaches 085 at about 1000K.
    • 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:50572082)资助的课题.
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出版历程
  • 收稿日期:  2007-03-22
  • 修回日期:  2007-06-05
  • 刊出日期:  2008-01-05

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