Structural and thermoelectric characterizations of high pressure sintered nanocrystalline Bi₂Te₃ bulks

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• 作者：Fengrong Yu ; Bo Xu ; ^{bxu@ysu.edu.cn} ; Jianjun Zhang ; Dongli Yu ; Julong He ; Zhongyuan Liu ; Yongjun Tian
• 关键词：A. Alloys ; A. Nanostructures ; C. High pressure ; D. Microstructure ; D. Thermal conductivity
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：47
• 期：6
• 页码：1432-1437
• 全文大小：1011 K

文摘

Using Bi₂Te₃ nanopowders prepared from ball milling of elemental Bi and Te, nanocrystalline Bi₂Te₃ bulks 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 Bi₂Te₃ bulk fabricated under 2 GPa exhibits good thermoelectric properties with ZT over 0.8 from 300 to 460 K and a peak ZT of 1.03 occurring at 403 K, 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.