| 纳米结构碲化铋合金的制备及电热输运特性 |
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| 引用本文： | 张忻,马旭颐,张飞鹏,武鹏旭,路清梅,刘燕琴,张久兴.纳米结构碲化铋合金的制备及电热输运特性[J].物理学报,2012,61(4):47201-047201. |
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| 作者姓名： | 张忻 马旭颐 张飞鹏 武鹏旭 路清梅 刘燕琴 张久兴 |
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| 作者单位： | 北京工业大学材料学院新型功能材料教育部重点实验室,北京,100124 |
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| 基金项目： | 国家自然科学基金(批准号: 50801002 ), 北京市自然科学基金(批准号: 2112007)及北京市属高校人才强教计划资助项目(批准号: PHR20110812)资助的课题. |
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| 摘 要： | 采用惰性气体保护蒸发-冷凝法制备了纳米Bi及Te粉末, 结合机械合金化和放电等离子烧结技术, 在不同烧结温度下制备出了单一物相且具有纳米层状结构及孪晶亚结构的n型Bi2Te3块体材料, 并系统研究了块体材料的晶粒尺度、微结构及其对电热传输特性的影响. SEM, TEM分析结果表明, 以纳米粉末为原料, 通过有效控制工艺条件, 可以制备出具有纳米层状结构Bi2Te3合金块体材料, 同时纳米层状结构中存在孪晶亚结构; 热电性能测试结果表明, 具有纳米层状结构及孪晶亚结构的块体试样与粗晶材料相比, 热导率大幅度降低, 在423 K附近, 热导率由粗晶材料的1.80 W/mK降至1.19 W/mK, 晶格热导率从1.16 W/mK降至0.61 W/mK, 表明纳米层状结构与孪晶亚结构共存, 有利于进一步提高声子散射, 降低晶格热导率. 其中在693 K放电等离子烧结后的试样于423K附近取得最大值的无量纲热电优值(ZT), 达到0.74.
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| 关 键 词： | 碲化铋合金 尺度效应 热导率 热电性能 |
| 收稿时间： | 2011-05-13 |
Synthesis and thermoelectric properties of nanostructured bismuth telluride alloys |
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| Zhang Xin,Ma Xu-Yi,Zhang Fei-Peng,Wu Peng-Xu,Lu Qing-Mei,Liu Yan-Qin and Zhang Jiu-Xing.Synthesis and thermoelectric properties of nanostructured bismuth telluride alloys[J].Acta Physica Sinica,2012,61(4):47201-047201. |
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| Authors: | Zhang Xin Ma Xu-Yi Zhang Fei-Peng Wu Peng-Xu Lu Qing-Mei Liu Yan-Qin and Zhang Jiu-Xing |
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| Institution: | The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China;The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China;The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China;The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China;The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China;The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China;The Key Laboratory of Advanced Functional Materials of China Education Ministry, Beijing University of Technology, College of Materials Science and Engineering, Beijing 100022, China |
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| Abstract: | The Bi and the Te nano-powders are prepared by inert gas protected evaporation-condensation method; the n-type Bi2Te3 bulk materials with nano-layer and twin crystallite sub-structures are then synthesized by mechanical alloying and spark plasma sintering technique. The effects of grain size and microstructure on thermoelectric property are also systematically studied. The SEM and the TEM analyseis show that the nano-layered Bi2Te3 bulk materials with twin crystallite sub-structures could be fabricated by controlling the preparing procedures. The thermoelectric property result shows that the thermal conductivity is lowered compared with that of bulk material of coarse-grained starting powders. The thermal conductivity decreases from 1.80 W/mK to 1.19 W/mK at 423 K, the lattice thermal conductivity decreases from 1.16 W/mK to 0.61 W/mK at 423 K, indicating that the phonon scattering could be enhanced due to the coexistence of nano-layer and twin crystallite sub-structures, leading to reduced phonon thermal conductivity. The dimensionless figure of merit ZT reaches 0.74 at 423 K for bulk materials sintered at 693 K. |
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| Keywords: | Bi2Te3 alloy size effect thermoelectric conductivity thermoelectric properties |
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