Enhancement of the thermoelectric performance in nano-/micro-structured p-type Bi0.4Sb1.6Te3 fabricated by mechanical alloying and vacuum hot pressing

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题名:	Enhancement of the thermoelectric performance in nano-/micro-structured p-type Bi0.4Sb1.6Te3 fabricated by mechanical alloying and vacuum hot pressing
作者:	鄭憲清;Lee, Pee-Yew;Chen, Tzu-Chien;Huang, Jing-Yi;Hsieh, Huey-Lin;Jang, Jason Shian-Ching
贡献者:	工學院材料科學與工程研究所
关键词:	Bi0.4Sb1.6Te3;Condensed matter: electronic structure, electrical, magnetic, and optical properties;Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures;Electronic transport in multilayers, nanoscale materials and structures;Exact sciences and technology;Mechanical alloying;Nano-/micro-structure;Physics;Thermoelectric material;Vacuum hot pressing
日期:	2015-01-15
上传时间:	2026-04-23 11:34:04 (UTC+8)
出版者:	Elsevier BV;Kidlington: Elsevier B.V
摘要:	摘要： (a) Top-view and (b) side-view of out morphology for Bi0.4Sb1.6Te3-40N disc after vacuum hot pressing at 573K under a pressure of 0.7GPa for 1h. (c) Temperature dependence of the ZT values of the Bi0.4Sb1.6Te3 bulk specimens prepared by different method •A dense nano-/micro-structured Bi0.4Sb1.6Te3 bulk composites was successfully fabricated.•A ZT value as high as 1.19 was achieved at 373K for the sample containing 40% nanograin powder.•Nano-/micro-structures can improve electrical conductivity and suppress thermal conductivity. Two types of Bi0.4Sb1.6Te3 powder exhibiting particle and grain-size differences were fabricated using a high-energy ball milling process. The mixtures at different ratios were consolidated by vacuum hot pressing to produce nano-/micro-structured composites with the same chemical compositions. Measurements of the Seebeck coefficient, electrical resistivity, and thermal conductivity provided a ZT value as high as 1.19 at 373K for a sample containing 40% nanograin powders. This ZT value is higher than that of the monolithic nanostructured Bi0.4Sb1.6Te3 sample. The ZT values of this sample at a temperature ranging between 400 and 495K are between 1.0 and 1.1. Such ZT characteristics make the ZT value suitable for power generation applications because no other materials with a similarly high ZT value have been observed in this temperature range. The achieved higher ZT value is potentially attributed to the unique nano-/micro-structures, in which the dispersed nanograin powders can increase phonon scattering sites and reduce thermal conductivity. Furthermore, the existence of micropowders can provide fast carrier transportation network that enhances electrical conductivity. The results indicated that the nano-/micro-structured Bi0.4Sb1.6Te3 alloy can serve as a high-performance material for application in thermoelectric (TE) devices. 出版者： Kidlington: Elsevier B.V 出版日期： 2014-12-05 出處： Journal of Alloys and Compounds, 2014-12, Vol.615, p.S476-S481 版權： 2013 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0925-8388 識別號： EISSN: 1873-4669 識別號： DOI: 10.1016/j.jallcom.2013.12.068
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