Magnetic and Structural Characteristics of the Pr2(Co,Fe)7B3 System

摘要

Pr2Co7-xFexB3 (0 < or = x < or = 7) alloys have been synthesized and studied attemperatures from 4 to 1100 K at fields up to 90 kOe. The structure and magnetic properties vary significantly with increasing Fe content. The material exhibits the Ce2Co7B3 structure for 0 < or = x < = 0.5. For 0.5 < pr = x < or = 3 the alloy is comprised of a main phase of hexagonal structure. A change in magnetocrystalline anisotropy occurs around x = 3.5; all alloys of x < or = 3 exhibit conical anisotropy at both 295 and 77 K, and axial anisotrop for x > 3.5. T. increases from 328 to 890 K when x varies from 0 to 3, then decreased to 564 K when x further increased to 7. The saturation magnetization, Ms , increases monotonically with increasing Fe content. A sintered magnet with a Br of 6.1 kG, a Hci of 10.6 kOe and a BHmax of 9.1 MGOe was obtained using Pr2CO2 Fe5B3.