摘要
介绍了β-FeSi2合金的基本特性和制备方法。评述了目前通过不同的元素掺杂可制得N型或P型β-FeSi2基半导体材料以及在热电性能方面取得的重要大进展。其中掺杂Co,B元素可得到N型β-FeSi2基半导体材料,且掺杂Co,在850K最大ZT值为0.4;而掺杂B,高于800K时Z值是未掺杂3￣6倍,在667K最大Z值为1.18×10-4K-1。掺杂Mn,Cu,Al可获得P型β-FeSi2基半导体材料,掺杂Mn在873K时最大Z值达2×10-4K-1;掺杂Cu可缩短β相的生成时间;掺杂Al,在743K获得的最大Z值为1.55×10-4K-1。指出通过结构优化、组分调整,进一步提高β-FeSi2基合金的热电性能。
On the basis of indicating basic characteristics of β-FeSi2 alloy, in this paper the effect of different doping elements such as Co, B, Mn and Al on the thermoelectric properties of β-FeSi2 was reported. As a better N type dopant, Co improved voltage power and at the same time decreased resistivity of β-FeSi2 based alloy. The maximum figure of ZT=0.4 at 850 K was obtained for Co-doped β-FeSi2. The maximum figure of Z of β-FeSi2 doped with Mn achieved 2×10^-4 K^-1 at 873 K. The preparation methods were discussed for β-FeSi2 doped alloy. The thermoelectric properties can be improved all the more by structural optimum, adjustment of ingredient and innovation of preparation methods, and β-FeSi2 will show extensive application prospect.
出处
《稀有金属快报》
CSCD
2006年第7期1-5,共5页
Rare Metals Letters
关键词
Β-FESI2
基合金
热电材料
热电优值
掺杂
声子散射
β-FeSi2based alloy
thermoelectric materials
thermoelectric merit figure
doping
phonon scattering
