| Popis: |
The magnetic properties of compounds of the R2Fe14B type (R Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er and Lu) have been systematically investigated by means of 57Fe Mossbauer spectroscopy. It is shown that relatively large differences in effective hyperfine fields are present at the siv crystallographically non-evuivalent iron sites and that these differences persist through the whole series. All siv hyperfine fields show a slight tendency to increase towards the middle of the lanthanide series. The magnetic phase transition in Er2Fe14B at about 330 K is shown to be due to a change in the direction of easy magnetivation from perpendicular to the c avis (T ⩽ 330 K) to parallel to the c avis (T ⩾ 300 K). |
