Influence of fast neutron and gamma irradiation on the thermoelectric properties of n-type and p-type SiGe alloy
Influence of fast neutron and gamma irradiation on the thermoelectric properties of n-type and p-type SiGe alloy
复制标题
快中子和γ辐照对n型和p型SiGe合金热电性能的影响
DOI：
10.1016/j.jnucmat.2019.151856
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发表时间：
2020-01-01
影响因子：
3.1
通讯作者：
Zhang, Chuanfei
中科院分区：
文献类型：
--
作者：
Li, Yixiao;Li, Jing;Zhang, Chuanfei
在放射性同位素热电发电机或空间反应堆电源中工作的热电材料将长期暴露于中子和γ射线的辐照下。本文研究了10（13）~ 10（15）n/cm（2）中子辐照剂量和10（4）戈伊γ辐照对n型和p型SiGe合金输运性质的影响。结果发现，中子辐照会导致缺陷，并导致载流子迁移率的急剧下降，为n型和p型SiGe。结果表明，中子辐照后，n型和p型SiGe的热电性能均急剧下降。但是，SiGe合金的热电性能可以通过适当温度下的热处理来恢复。n型SiGe比p型SiGe对中子辐照更敏感。经10（15）n/cm（2）中子辐照后，n型SiGe的电导率、功率因数和ZT分别下降到未辐照样品的0.014%、5%和3.8%，而p型SiGe的电导率、功率因数和ZT分别下降到未辐照样品的0.14%、12%和5.2%。n型SiGe的愈合温度为1273 K，而p型SiGe的愈合温度为623 K。γ辐照对SiGe合金的输运性质没有明显的影响。(C)2019年爱思唯尔出版
The thermoelectric materials that work in radioisotope thermoelectric generators or space reactor power sources will be exposed to neutron irradiation and gamma irradiation for a long time. Herein, the influences of neutron irradiation doses between 10(13) n/cm(2) and 10(15) n/cm(2), and gamma irradiation of 10(4) Gy, on the transport properties of n- and p-type SiGe alloys were investigated. It was found that, neutron irradiation causes defects, and leads to a dramatic decrease in carrier mobility for both n- and p-type SiGe. As a result, the thermoelectric properties of both n- and p-type SiGe decline steeply after neutron irradiation. However, the thermoelectric properties of SiGe alloys can be restored by heat treatment at proper temperature. The n-type SiGe is more sensitive to neutron irradiation than p-type SiGe. After 10(15) n/cm(2) neutron irradiation, the electrical conductivity, power factor and ZT of n-type SiGe decrease to 0.014%, 5% and 3.8% that of an un-irradiated sample; while the electrical conductivity, power factor, and ZT of p-type SiGe decrease to 0.14%, 12% and 5.2% that of an un-irradiated sample. The healing temperature is 1273 K for n-type SiGe, while 623 K for p-type SiGe. Gamma irradiation has no obvious effect on the transport properties of SiGe alloys. (C) 2019 Published by Elsevier B.V.