无机材料学报2024，Vol.39Issue(8)：895-902,中插4,9.DOI:10.15541/jim20240012
P掺杂β-FeSi2材料的制备与热电输运性能
Preparation and Thermoelectric Transport Properties of P-doped β-FeSi2
摘要
Abstract
β-FeSi2,an environmentally friendly and high temperature oxidation-resistant thermoelectric material,has potential applications in the field of industrial waste heat recovery.Previous studies have shown that phosphorus(P),an ideal n-type dopant in the silicon(Si)site of β-FeSi2,can easily lead to the formation of a secondary phase,thereby limiting the enhancement of thermoelectric performance.In this study,a series of FeSi2-xPx(x=0,0.02,0.04,0.06)samples were synthesized using an induction melting method,which greatly inhibited the formation of the secondary phase.Then,the influence of P doping on the electrical and thermal transport properties of β-FeSi2 was studied.The results indicate that the solubility limit of P in β-FeSi2 is about 0.04,consistent with earlier theoretical predictions based on the defect formation energy.It is also discovered that P doping enhanced the thermoelectric performance of β-FeSi2,culminating in an optimal figure of merit(ZT)of FeSi1.96P0.04 approximately 0.12 at 850 K,which is much higher than the previous results(ZT about 0.03 at 673 K).However,compared to β-FeSi2 doped with other n-type elements like cobalt(Co)and iridium(Ir),which can achieve carrier concentrations up to 1022 cm-3,P-doped β-FeSi2 exhibits lower carrier concentrations,with the highest of only 1020 cm-3.This results in a weaker electron-phonon scattering effect,which in turn constrains the overall enhancement of the thermoelectric performance.If the carrier concentration could be further increased,the thermoelectric performance of the material is expected to evolve significantly.关键词
β-FeSi2/热电材料/P掺杂/感应熔炼/载流子浓度/电声散射Key words
β-FeSi2/thermoelectric material/P doping/induction melting/carrier concentration/electron-phonon scattering分类
通用工业技术引用本文复制引用
程俊,张家伟,仇鹏飞,陈立东,史迅..P掺杂β-FeSi2材料的制备与热电输运性能[J].无机材料学报,2024,39(8):895-902,中插4,9.基金项目
国家自然科学基金(52122213) （52122213）
国家重点研发计划(2023YFB3809400) National Natural Science Foundation of China(52122213) （2023YFB3809400）
National Key R&D Program of China(2023YFB3809400) （2023YFB3809400）
