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利用X射线衍射分析仪、透射电镜、振动样品磁强计和差示扫描量热仪研究贫稀土非晶Pr4.5Fe77B18.5合金中Fe3B/Pr2Fe14B复合纳米晶的晶体结构、磁性能及其晶化动力学。结果表明,经650℃晶化退火处理后,Pr4.5Fe77B18.5合金的晶化相主要由软磁相Fe3B和硬磁相Pr2Fe14B组成,而且退火后复合纳米晶磁体晶粒细小、分布均匀,磁滞回线呈现单一的硬磁特征,表明其具有较强的交换耦合作用。晶化动力学研究表明,软磁相Fe3B易成核、难生长和Pr2Fe14B相的难成核易生长的晶化行为是Fe3B/Pr2Fe14B复合纳米磁体具有较好磁耦合性能的根本原因。
Study on Crystal Structure, Magnetic Properties and Crystallization of Fe3B / Pr2Fe14B Composite Nanocrystals in Amorphous Pr4.5Fe77B18.5 Alloy by X-Ray Diffraction, Transmission Electron Microscopy, Vibrational Sample Magnetometer and Differential Scanning Calorimeter dynamics. The results show that the crystallized phase of Pr4.5Fe77B18.5 alloy is mainly composed of soft magnetic phase Fe3B and hard magnetic phase Pr2Fe14B after annealing at 650 ℃, and the composite nanocrystalline magnet has fine grains and uniform distribution after annealing Hysteresis curve shows a single hard magnetic characteristics, indicating that it has a strong exchange coupling. Crystallization kinetics studies show that the soft magnetic phase Fe3B easy nucleation, refractory growth and Pr2Fe14B phase difficult nucleation and easy growth of the crystallization behavior of Fe3B / Pr2Fe14B composite nanomaterials have better magnetic coupling properties of the root causes.