Structure and magnetic properties of Sm/sub 3/(Fe/sub 0.85/Cr/sub 0.15/)/sub 29/N/sub y/ alloys

The structure and magnetic properties of Sm/sub 3/(Fe/sub 0.85/Cr/sub 0.15/)/sub 29/N/sub y/ alloy were investigated. It was found that the alloy had the R/sub 3/(Fe,M)/sub 29/-type structure and absorbed 4-5 wt.% of nitrogen which exceeds 4 nitrogen atoms per unit formula. The coercivity of the powder was greatly influenced by the nitrogen content and annealing. The Sm/sub 3/(Fe/sub 0.85/Cr/sub 0.15/)/sub 29/N/sub y/ alloy powder with 4.1 wt.% of nitrogen showed a high coercivity of 552 kA/m without fine grinding.