原位氧化对Al掺杂β-FeSi_2热电材料结构与性能的影响  

Electric transport properties of aluminium doped iron disilicide thermoelectric materials

作　　者：芦玉峰[1] 赵新兵[1] 倪华良[1] 陈海燕[1] 

机构地区：[1]浙江大学硅材料国家重点实验室

出　　处：《材料研究学报》2003年第5期471-476,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金No.59971044;国家自然科学基金No.50171064

摘　　要：研究了快速凝固/热压Al掺杂FeSi_2基合金中的微观组织特征以及原位生成氧化物颗粒对热电材料电学性能的影响。结果表明,随着对快速凝固粉末氧化处理时间的延长,p型掺杂的β-FeSi_2半导体会先转变成n-型,然后又转变成p-型半导体,并存在“热伏极性反转”现象.氧化处理降低β-FeSi_2基热电材料的电学性能,未经氧化处理的FeAl_(0.1)Si_2材料在测量温度范围内的功率因子最大,在500℃达到465μW·m^(-1)·K^(-1)。The effects of the in-situ formed oxide particles on the microstructures and electric transport properties of the rapidly solidified and hot-pressed aluminium doped iron disilicides have been investigated. It was found that the hot-pressed p-type doped iron disilicide semiconductor can change to n-type and further to p-type with the increase of oxidation time for the rapidly solidified powders. A phenomenon of thermo-voltage type reversion was found experimentally, that is, the type of a p-type sample could reverse to n-type apparently when the measuring temperature decreased. It was shown that the electric transport properties decreased because of the oxidation of the powders. The highest power factor of 465×10-6 W&middotm-1&middotK-1 at 500°C was obtained for the sample FeAl0.1Si2 without oxidation.

关 键 词：无机非金属材料 热电材料 快速凝固/热压 原位氧化 FeSi2 热电势系数 

分 类 号：TN304[电子电信—物理电子学] TB381[一般工业技术—材料科学与工程]