Microstructure and magnetic properties of FeAs with coarse-grain and nanocrystalline structure

作     者：Yuan ZHOU Yun-yan WANG Yan-jie LIANG Yi-wei ZHOU Zhen-xing LIU Cong PENG Yong KE Xiao-bo MIN 周元;王云燕;梁彦杰;周艺伟;刘振兴;彭聪;柯勇;闵小波

作者机构：School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal PollutionChangsha 410083China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2022年第32卷第3期

页      面：972-979页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：the financial support from National Key Technologies R&D Program of China (No. 2018YFC1900302) 

主　　题：high-energy ball milling iron arsenide coercivity magnetization 

摘      要：The microstructure and magnetic properties of iron arsenide(FeAs) with coarse-grain and nanocrystalline structure were investigated. Coarse-grain FeAs was synthesized through high-energy ball milling and heat treatment. Nanocrystalline FeAs was obtained by ball milling of coarse-grain FeAs. The results suggest that the reduced grain size of FeAs(from 100 to 32.4 nm) is accompanied by the introduction of internal strains up to 0.568% with ball milling time from 0 to 32 h. The magnetic properties of FeAs show that the coercivity is reduced from 29.2 to 15.6 kA/m and the magnetization is increased over time of milling. The low coercivity is mainly due to the small grain size stemmed from ball milling, while the increase of magnetization is primarily caused by the change of lattice parameters of FeAs and the emergence of superparamagnetic phase at the same time.