Structure and intrinsic magnetic properties of MM₂Fe₁₄B (MM=La, Ce, Pr, Nd) alloys

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• 作者：Xiaoqiang YU (余效强)^a ; Ming YUE (岳 明)^a ; ^{yueming@bjut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Weiqiang LIU (刘卫强)^a ; Zhi LI (李 智)^a ; Minggang ZHU (朱明刚)^b ; Shengzhi DONG (董生智)^b
• 关键词：misch-metal ; structure ; intrinsic magnetic properties ; MM33Fe66B alloys ; microstructure ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：34
• 期：6
• 页码：614-617
• 全文大小：745 K

文摘

MM₃₃Fe₆₆B (MM=La, Ce, Pr, Nd) alloys (mass ratio) were prepared by induction melting and heat-treated at 1353 K for 24 h to produce homogeneous MM₂Fe₁₄B phase. The phase structure and element distribution of the alloys were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The alloys were applied ball milling to obtain powders with good size distribution and then magnetic aligned in a static magnetic field of 2 T for 4 h, in order to achieve the intrinsic magnetic properties by vibrating sample magnetometer (VSM). XRD results showed that the alloys were composed of the single 2:14:1 main phase and RE-rich phase, which was similar to Nd₂Fe₁₄B structure. Magnetic measurements showed that the saturation magnetization (M_s) and anisotropy field (H_A) of the MM₃₃Fe₆₆B alloy were 11.3 kGs and 48.4 kOe, respectively, demonstrating its good potential as permanent magnets. The Curie temperature of the MM₃₃Fe₆₆B alloy was determined as 502.9 K by magnetization-temperature curves. Microstructure observation showed that Nd and Pr were mainly in the 2:14:1 ferromagnetic phase, while La and Ce prefered to aggregate in the RE-rich grain boundary phase, which is beneficial to fabricating (Pr, Nd, MM)₂Fe₁₄B magnets with good magnetic properties.