Abstract
The main phase in as-cast SmCo 7− x Ti x ( x=0.3, 0.4, 0.5, 0.6) magnets is found to have the TbCu 7-type structure. The c/ a ratio decreases with increasing Ti concentration x, but the unit cell volume increase with x. A minor amount of a rhombohedral Th 2Zn 17-type phase was detected at x=0.3, 0.4, and an another Ce 2Ni 7-type phase with low Curie temperature appeared when x exceeds 0.5. No more than 0.1 T of intrinsic coercivity was obtained in the as-cast samples. After annealing, the TbCu 7-type SmCo 7− x Ti x magnets decomposed into 1 : 5 and 2 : 17 phases, with a slight increase in coercivity compared with the corresponding as-cast samples up to a maximum of 0.24 T. The as-milled amorphous SmCo 7− x Ti x magnets recrystallised with TbCu 7-type structure after annealing at 750°C for 2 h. High intrinsic coercivities of more than 2.0 T were obtained for almost all compositions, and maximum coercivity of 2.5 T was found for the ball-milled SmCo 6.6Ti 0.4 magnet. The high coercivity of the ball-milled SmCo 7− x Ti x magnets is attributed to the strong pinning of the walls of the ‘interaction domains’ by the network of grain boundaries between the nanocrystalline grains.
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