Reduced Remanence to Coercivity Increase Ratio of Pr₁₁,76_xDy_xFe₈₂B₆ (x = 0; 1; 2; 3) Permanent Magnets

Dysprosium substituted Pr-Fe-B permanent magnet samples with Pr₁₁, _76-xDy_xFe₈₂B₆ (x = 0, 1, 2 and 3) composition were made up by compacting the crystalline fine powders prepared through mechanical milling and successive high power ultrasonic irradiation. The (Pr,Dy)-Fe-B alloys with designated compositions were obtained from arc melted the charges that consisted of respectively Dy-Fe, Fe₃B alloys and pure Fe and Pr metals. Results of the xrd analysis are permanent magnetic samples confirmed that the mass of the compound fraction formed is 90.07%. A change in lattice parameter of Pr₂Fe₁₄B phase occurred when Pr was partially substituted by Dy. Furthermore, the effect of dy partial substitution on magnetic properties can increase the coercivity value, but with a decrease in saturation magnetic. Dy = 3 substitution produces coercivity and remanence values of 160 kA/m and 0.275 T respectively in the permanent magnet category.