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半导体热电制冷材料的研究进展 总被引:14,自引:0,他引:14
热电制冷是一种直接利用电-热转换达到制冷目的的固体制冷技术.介绍了近年来关于热电材料的实验研究和理论研究的国内外现状,以及目前材料研究存在的问题,介绍了各种材料的研究进展及热电制冷的应用状况. 相似文献
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热电材料的应用及研究进展 总被引:5,自引:0,他引:5
热电材料是一种能将热能和电能相互转换的功能材料,1823年发现的塞贝克效应和1834年发现的珀尔帖效应为热电能量转换器和热电制冷的应用提供了理论基础。在此发现之后,1911年,德国的Ahenkrich提出了热电发电和制冷理论模型:优良的热电材料应当具有高的塞贝克系数(α)、低的热导率(κ)、高的电导率(σ)。对 相似文献
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氧化物热电材料以其独特的优点倍受人们的关注。本文概述了非钴基氧化物热电材料的研究现状,分析了影响提高其热电性能的主要因素,并指出了该类氧化物的未来发展方向。 相似文献
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This study designs a microscaled thermoelectric component featuring a nanogap of varying size (133–900 nm) between the tips of the component. Electricity and heat are transmitted between the gap of the tips through the thermionic emission of electrons. Because the gaps exhibit a discontinuous structure, the phonon's contribution to thermal conductivity can be virtually neglected, thereby enhancing the thermoelectric figure of merit (ZT) of the designed thermoelectric component. The experimental results reveal that a narrow tip gap generates stronger thermoelectric effects, with Seebeck voltage and Seebeck coefficient being respectively, one and two orders of magnitude greater than those of the thermoelectric effects of nanowires. The thermoelectric figure of merit without considering the contributions from other heat carriers is higher than the value of thermoelectric devices developed in recent years. For a set of asymmetrical thin film electrodes of differing sizes, the thermoelectric effects generated in the heating process of large thin films are stronger than those of small thin films. Furthermore, adding nanoparticles to the nanogap facilitate the thermionic emission of electrons, in which electrons hop from the hot end to the cold end, thereby intensifying the thermoelectric effects of the nanogap. 相似文献
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Thermoelectric materials are of interest for applications as heat pump and power generators. The performance of a thermoelectric material, the figure of merit, ZT, is measured. The figure of merit is interrelated to the thermal conductivity, electrical conductivity, and Seebeck coefficient. All of these parameters are functions of temperature. The performance of a Bi–Te–Sb–Se thermoelectric material at low temperature was studied experimentally in this work. Based on the experimental results, the relation between various parameters and temperature, and the figure of merit are reported. The conclusions indicate that this thermoelectric material is not suitable for power generation at low temperature, and only an improvement of production technology or the development of a new production method can improve the electrical power generation performance with this method.Paper presented at the Seventh Asian Thermophysical Properties Conference, August 23–28, 2004, Hefei and Huangshan, Anhui, P. R. China. 相似文献
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高通量材料实验旨在利用较少的实验次数快速获得成分-物相-结构-性能之间关系, 筛选出组分最优的材料体系, 目前已在超导材料、荧光材料以及巨磁阻材料等方面有较多应用。热电材料是可以实现热能和电能直接相互转换的功能材料, 在温差发电和废热利用等领域有着重要的应用价值, 但热电材料的传统实验制备与表征方法存在着实验周期长和效率低等问题。因此, 将高通量实验的方法和理念引入新型热电材料的研发和优化具有重要的理论和实际意义。本文主要总结和梳理了现有在热电材料实验研究中具有较好应用前景的高通量实验制备与表征技术, 包括高通量样品制备、成分-结构高通量表征、电-热输运性能高通量表征等, 并分析了各高通量实验技术在实验热电材料研究中的优势和局限性, 希望为今后热电材料高通量实验优化和筛选提供一定的参考。 相似文献