Effects of Co Substitution on the Magnetic and Microstructural Properties of Melt-Spun Pr{sub}Tb{sub}1Fe{sub}(87-x)Co{sub}xNb{sub}0.5Zr{sub}0.5B{sub}4 Nanocomposites

摘要

The magnetic and microstructural properties of melt-spun Pr{sub}7Tb{sub}1Fe{sub}(87-x)Co{sub}xNb{sub}0.5Zr{sub}0.5B{sub}4 (x = 0,10,20,30) nanocomposites have been investigated. Optimum magnetic properties are found with coercivity H{sub}c = 6.84 kOe and (BH)m = 11.8 MGOe in the sample of Pr{sub}7Tb{sub}1Fe{sub}87Nb{sub}0.5Zr{sub}5B{sub}4. For the samples with x = 10,20, and 30, both the coercivity and the energy product decrease. The main reason for this deterioration is the decrease in the anisotropy of 2:14:1 phase and the changing morphology of a-Fe and 2:14:1 phases. Co also increases the Curie temperature of all the phases present, including the hard and soft phases.