High-temperature magnetic properties of mechanically alloyed SmCo{sub}5 and YCo{sub}5 magnets

摘要

The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo{sub}5(R = Sm and V) is studied. The annealed materials have the hexagonal CaCu{sub}5 structure with 2 : 17 (or 1 : 7) regions as a minor phase. High-temperature magnetic measurements show that the coercivities of materials decrease with increasing temperature from room-temperature to 873 K, but that the temperature coefficient of the coercivity of YCo{sub}5 is much smaller than that of SmCo{sub}5. This behavior is explained in terms of the intrinsic temperature variation of the magnetocrystalline anisotropy.