Structure and intrinsic magnetic properties of Sm_1-xPr_xCo₅（x=0–0.6） compounds

Miao-Ling Xu¹，Ming Yue¹，Yu-Qing Li¹，Qiong Wu¹，Yun Gao²

1. College of Materials Science and Engineering, Beijing University of Technology2. Samsung Advanced Institute of Technology

摘 要：In this work, the effects of Pr content on the structure and intrinsic magnetic properties of Sm_1-xPr_xCo₅（x = 0–0.6） compounds prepared by induction melting were systematically investigated by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and magnetic measurements. Microstructural observation and chemical composition analysis show that Sm_1-xPr_xCo₅ compounds are composed of（Sm, Pr）Co（1:5） phase and（Sm, Pr）-rich grain boundary phase. XRD results show that all the Sm_1-xPr_xCo₅ compounds have a（Sm, Pr）₁Co₅ main phase with the hexagonal CaCu₅-type crystal structure and the（Sm, Pr）₂Co₇ impurity phase. In addition, the detailed research shows that the lattice constants（a, c） and unit volume（V） are all enlarged with the increases in Pr content. According to the magnetic measurements, as the Pr content increases to larger than 0.4, both the Curie temperature（T_C） and the anisotropy field（H_A） of all the Prdoped compounds decrease rapidly. Meanwhile, the magnetization of Sm_1-xPr_xCo₅ compounds at applied field of 14 T(M_{14 T}) are observably improved with Pr doping content of x>0.3. Among them, Sm_0.6Pr_0.4Co₅ compound exhibits slightly lower H_Aand T_C, but much higher M_{14 T} than those of the binary SmCo₅, indicating that doping of proper Pr content into SmCo₅ compound can optimize the intrinsic magnetic properties. As a result, the optimal intrinsic magnetic properties of H_A= 29.11 T,T_C= 989 K, and M_{14 T}= 102.31 mA·m²·g-1are obtained in Sm_0.6Pr_0.4Co₅ compound.

关键词：