Abstract

The effect of boron content on the magnetic properties, phase evolution and the exchange coupling effect of Pr/sub 9/Fe/sub 88.5-x/Ti/sub 2.5/B/sub x/ ribbons is investigated. By increasing the boron content, the optimal magnetic properties of B/sub r/=9.5 kG, /sub j/H/sub c/=10.8 kOe, and (BH)/sub max/=17.8 MGOe are obtained for Pr/sub 9/Fe/sub bal./Ti/sub 2.5/B/sub 11/. Further substituting 10 at% Co for Fe in the Pr/sub 9/Fe/sub bal./Ti/sub 2.5/B/sub 11/ alloy enhances the magnetic properties for Pr/sub 9/Fe/sub 67.5/Co/sub 10/Ti/sub 2.5/B/sub 11/. Based on thermal magnetic analysis of the optimized Pr/sub 9/Fe/sub 88.5-x/Ti/sub 2.5/B/sub x/ ribbons, three phases Pr/sub 2/Fe/sub 14/B, /spl alpha/-Fe and a small amount of Pr/sub 2/Fe/sub 23/B/sub 3/ phases prevailed in the ribbons with x=15. For x=7-13, only Pr/sub 2/Fe/sub 14/B and /spl alpha/-Fe phases were found. Increasing x increases the volume fraction of Pr/sub 2/Fe/sub 14/B phase and decreases the /spl alpha/-Fe phase, giving rise to the increment of /sub j/H/sub c/ and the decrement of B/sub r/. But a decrement of the volume fraction of total magnetically phases, i.e. /spl alpha/-Fe and Pr/sub 2/Fe/sub 23/B/sub 3/, results in the deterioration of both B/sub r/ and (BH)/sub max/ drastically as x=15.

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