Structure and magnetic properties of Sm(Co/sub bal/Fe/sub x/Ti/sub 0.05/)/sub 9.66/ alloys (x=0-0.57) and Sm(Co/sub 0.66/Fe/sub 0.19/Ti/sub 0.05/Cu/sub 0.1/)/sub 9.66/ magnets

Potential permanent magnetic materials with compositions of Sm(Co/sub bal/Fe/sub x/Ti/sub 0.05/)/sub 9.66/ (x=0-0.57) have been synthesized and characterized in the temperature range of 10-1473 K and at fields up to 5 T. The experimental results show that near single phase materials with Th/sub 2/Ni/sub 17/ structure were formed in Sm(Co/sub bal/Fe/sub x/Ti/sub 0.05/)/sub 9.66/ alloys after splat quenching from 1473 K. The Ti atoms play an important role in stabilizing the Th/sub 2/Ni/sub 17/ structure for the 3d (transition metal) rich nonstoichiometric 2-17 compounds. Encouraging hard magnetic properties with T/sub c//spl sim/890-1066 K, M/sub s//spl sim/10.8-13.7 kG, H/sub a//spl sim/30-125 kOe at 300 K were observed in Sm(Co/sub bal/Fe/sub x/Ti/sub 0.05/)/sub 9.66/ alloys. Both Sm(Co/sub 0.66/Fe/sub 0.19/Ti/sub 0.05/Cu/sub 0.1/)/sub 9.66/ sintered and melt-spun powder magnets with 4/spl pi/M/sub s//spl ges/10 kG were fabricated. A strong domain wall pinning behavior with H/sub c//spl sim/1.6 kOe at RT and H/sub c//spl sim/4.3 kOe at 10 K was observed. The effect of different heat treatment conditions on the phase formation of Sm(Co/sub bal/Fe/sub x/Ti/sub 0.05/)/sub 9.66/ alloys was also discussed.