科技报告详细信息
Extreme solid state refrigeration using nanostructured Bi-Te alloys. | |
Lima Sharma, Ana L. (San Jose State University, San Jose, CA) ; Spataru, Dan Catalin ; Medlin, Douglas L. ; Sharma, Peter Anand ; Morales, Alfredo Martin | |
关键词: ALLOYS; CRYOGENICS; CRYSTAL GROWTH; MONOCRYSTALS; NITROGEN; PERFORMANCE; PHYSICS; REFRIGERATION; TRANSPORT; | |
DOI : 10.2172/993612 RP-ID : SAND2009-5978 PID : OSTI ID: 993612 Others : TRN: US201024%%90 |
|
学科分类:材料科学(综合) | |
美国|英语 | |
来源: SciTech Connect | |
![]() |
【 摘 要 】
Materials are desperately needed for cryogenic solid state refrigeration. We have investigated nanostructured Bi-Te alloys for their potential use in Ettingshausen refrigeration to liquid nitrogen temperatures. These alloys form alternating layers of Bi{sub 2} and Bi{sub 2}Te{sub 3} blocks in equilibrium. The composition Bi{sub 4}Te{sub 3} was identified as having the greatest potential for having a high Ettingshausen figure of merit. Both single crystal and polycrystalline forms of this material were synthesized. After evaluating the Ettingshausen figure of merit for a large, high quality polycrystal, we simulated the limits of practical refrigeration in this material from 200 to 77 K using a simple device model. The band structure was also computed and compared to experiments. We discuss the crystal growth, transport physics, and practical refrigeration potential of Bi-Te alloys.【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO201705170001153LZ | 464KB | ![]() |