jHc, Jr and (BH)max relationship in PrFeB melt spun alloys

H-j(o), J(r) and (BH)(max) correlations were experimentally studied for a series of PrxFe94-xB6 alloys, with x ranging from 6 to 20 at%. The results show that the variation of the Pr content and the casting parameters yielded to H-j(c) ranging from values near 0 to similar to 2200 kA/m. J(r) increased at the expense of H-j(c) in agreement with some theoretical investigations related to J(r)/H-j(c) relationship. This behaviour changed for H-j(c) values lower than similar to 200kA/m, where J(r) and H-j(c) diminish together. (BH)(max) showed a similar behaviour to J(r) up to values of H-j(c) similar to 450kA/m (30% alpha-Fe) where a maximum was observed and then a decrease with reducing H-j(c). The results are analysed and discussed based on theoretical and experimental investigations carried out by some other workers and compared with results reported for the NdFeB system. (C) 2000 Elsevier Science B.V. All rights reserved.