Structural and thermoelectric characterizations of high pressure sintered nanocrystalline Bi2Te3 bulks
Structural and thermoelectric characterizations of high pressure sintered nanocrystalline Bi2Te3 bulks
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DOI：
10.1016/j.materresbull.2012.02.045
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发表时间：
2012-06
影响因子：
5.4
通讯作者：
Fengrong Yu;Bo Xu;Jianjun Zhang;D. Yu;Julong He;Zhongyuan Liu;Yongjun Tian
中科院分区：
文献类型：
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作者：
Fengrong Yu;Bo Xu;Jianjun Zhang;D. Yu;Julong He;Zhongyuan Liu;Yongjun Tian
以Bi和Te为原料，采用球磨法制备了Bi 2 Te 3纳米粉体，并采用变压高压烧结技术制备了Bi 2 Te 3纳米晶块体。的结构和热电性能进行了表征，揭示了强烈的相关性与烧结压力。在2GPa下制备的纳米晶Bi 2 Te 3块材在300 ~ 460 K范围内具有良好的热电性能，ZT值在0.8以上，在403 K处出现峰值ZT为1.03，这是由于晶界和缺陷增强了声子散射而导致的较小热导率以及与区熔材料相当的良好电学性能所致。
Using Bi2Te3nanopowders prepared from ball milling of elemental Bi and Te, nanocrystalline Bi2Te3bulks were fabricated with high pressure sintering technique under variable pressures. The structural and thermoelectric properties were characterized, revealing a strong correlation with the sintering pressure. The nanocrystalline Bi2Te3bulk fabricated under 2GPa exhibits good thermoelectric properties with ZT over 0.8 from 300 to 460K and a peak ZT of 1.03 occurring at 403K, which can be attributed to the small thermal conductivity from enhanced phonon scattering by grain boundaries and defects, as well as to the good electrical property comparable to that of the zone melting material.