Abstract
Pr2Co7−xFexB3(0≤x≤7) alloys have been synthesized and studied at temperatures 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≤x≤0.5. For 0.5≤x≤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≤3 exhibit conical anisotropy at both 295 and 77 K, and axial anisotropy for x≥3.5. Tc 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 were obtained using Pr2Co2Fe5B3.
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