NUCLEAR-MAGNETIC-RESONANCE AND MOSSBAUER-EFFECT STUDIES OF MELT-SPUN PRXND4-XFE77.5B18.5 ALLOYS

The effect of Pr substitution on the phase composition and B-11 and Fe-57 hyperfine fields (Hfs) in the samples of Nd4Fe77.5B18.5 has been investigated by means of-zero field spin-echo nuclear magnetic resonance (NMR) and Mossbauer effect(ME). It was found that the phase components had not been influenced by the addition of Pr atoms. The samples annealed at 670 degrees C for about two min. consist of a mixture of body-centered-tetronagonal Fe3B(bct-Fe3B) and alpha-Fe. Furthermore, B-11 NMR peaks of bct-Fe3B broaden to the high-frequency side in the rare earth elements-contained samples compared with pure bct-Fe3B. The substitution of Pr for Nd has not an obvious effect on B-11 hyperfine field.