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The magnetic properties, phase evolution, and microstructure of melt-spun Pr9Fe88.5-xTi2.5Bx(x=7 to 15) nanocomposites have been investigated. From thermal magnetic analysis (TMA), the volume fraction of Pr2Fe14B phase increases and α-Fe phase decreases with increasing x, giving rise to the increment of iHc and the decrement of Br. But the average grain size of the ribbons is slightly decreased with the increment of boron content x, from 15-30 nm for x=7 to 10--20 nm for x=15. As a result, the optimum magnetic properties of Br=9.5 kG, iHc=10.8 kOe, and (BH)max=17.8 MGOe can be achieved in Pr9Febal.Ti2.5B11. In addition, further substituting Co for Fe in Pr9Fe77.5-yCoyTi2.5B11 ribbons not only increases the Curie temperature of magnetic phases 2:14:1 and α-Fe, but also improves the thermal stability of the ribbons. Higher magnetic properties of Br=9.7 kG, iHc=11.3 kOe, and (BH)max=18.5 MGOe are obtained in Pr9Fe67.5Co10Ti2.5B11 ribbons.
Date of Publication: Oct. 2005