Title :
Structure and magnetic properties of mechanically alloyed SmCo7 compound
Author :
Yang, Jun ; Mao, O. ; Altounian, Z.
Author_Institution :
Center for the Phys. of Mater., McGill Univ., Montreal, Que., Canada
fDate :
9/1/1996 12:00:00 AM
Abstract :
The relationship between phase transformation and magnetic properties of mechanically alloyed (MA) SmCo7 alloys at different annealing temperatures has been studied. The MA alloy is a mixture of an amorphous phase and a TbCu7-type phase, and has low coercivity. Upon annealing, the coercivity initially increases with the amount of SmCo7 phase. Maximum coercivity of 18 kOe has been obtained on single phase TbCu7-type SmCo7 compound by annealing at 650°C. At higher annealing temperature, coercivity first decreases with the appearance of CaCu6-type SmCo6 phase and still further with the formation of Th2 Zn17-type Sm2Co17 phase at 800°C
Keywords :
annealing; cobalt alloys; coercive force; crystal structure; ferromagnetic materials; mechanical alloying; permanent magnets; samarium alloys; solid-state phase transformations; 650 C; 800 C; SmCo7; annealing temperatures; low coercivity; magnetic properties; maximum coercivity; mechanically alloyed SmCo7; phase transformation; structure; Anisotropic magnetoresistance; Annealing; Argon; Cobalt; Coercive force; Grain size; Magnetic properties; Magnets; Powders; Samarium;
Journal_Title :
Magnetics, IEEE Transactions on
