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Development of environmental conservation type thermoelectric device of silicide compounds and their power generation modules

环保型硅化物热电器件及其发电模块的研制

基本信息

批准号：
13555188
负责人：
UMEMOTO Minoru
金额：
$ 8.32万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Recently, thermoelectric materials are attracted as an energy-conversion technology between thermal energy and electric energy directly, and are possible to utilize low-grade energy, i.e. waste heat at middle- and the low-temperature. At present, Bi_2Te_3, CoSb_3 and SiGe are principally investigated and applied. These compounds, however, are composed of poisonous, limit in resource, and/or expensive elements. Therefore, the application of these materials is restricted, and also the use of these materials will be controlled in the near future in order to the pollution abatement of environment. In this study, thermoelectric materials composed of atoxic and resource-rich elements were developed, and investigated the effect of the dopant on the thermoelectric properties. The results obtained in this study are as follows.1. In Al-doped Mg_2Si compounds, the maximum figure of merit of 0.67×10^<-3> K^<-1> was obtained at 856 K for the specimen with nominal Al content of 0.15 at%. The obtained figure of merit is comparable to that reported for Si-Ge, suggests that Al doped Mg_2Si is a good candidate material for thermoelectric energy conversion in the middle-temperature range.2. Fe_2VAl_<0.95>Si_<0.05> compound showed a high power factor value of 3.1×10^<-3> Wm^<-1>K^<-2>. This value is comparable that of Bi_2Te_3 known as the best thermoelectric materials in the low-temperature range. This suggests that Si doped Fe_2VAl compounds is a good candidate thermoelectric material in the low-temperature range.3. Al-doped Mg_2Si and Si doped Fe_2VAl compounds are n type. The development of highly efficiency p type thermoelectric materials is needed.

近年来，热电材料作为一种直接在热能和电能之间进行能量转换的技术而受到人们的关注，并且可以利用低品位的能量，即在中低温下的废热。目前主要研究和应用的是Bi_2Te_3、CoSb_3和SiGe。然而，这些化合物由有毒的、资源有限的和/或昂贵的元素组成。因此，这些材料的应用受到限制，并且在不久的将来，这些材料的使用也将受到控制，以减少环境污染。本研究开发了由无毒、资源丰富的元素组成的热电材料，并研究了掺杂剂对热电性能的影响。本研究取得的主要结果如下：1.在掺Al的Mg_2Si化合物中，<-3><-1>标称Al含量为0.15at%的样品在856 K时获得最大优值0.67×10^ K^。结果表明，掺Al的Mg_2Si是一种很好的中温热电转换材料. <0.95>Fe_2VAl_Si_3<0.05>化合物具有3.1×10 ~（-1）Wm ~（-1）K ~（-1）的高功率因数<-3><-1><-2>。该值与低温热电材料Bi_2Te_3相当。这表明Si掺杂的Fe_2VAl化合物是一种很好的低温热电材料. Al掺杂的Mg_2Si和Si掺杂的Fe_2VAl化合物为n型。需要开发高效的p型热电材料。