EFFECT OF Nd-SUBSTITUTION ON THE MAGNETOCALORIC PROPERTIES AND 1:13-PHASE FORMATION OF SINTERED La(FeCoSi)_(13)

摘要

The effects of partial substitution of La by Nd in La_(1-a)NdaFe_(13-x-y)CoySi_x alloys (0 ≤ α ≤ 0.12) are investigated. Our results suggest that the impact of Nd on the magnetocaloric properties correlates to the Co concentration. In Co-poor samples (y = 0.68), a reduction of the Curie temperature by –27.17℃/f.u._(Nd), is observed. The addition of Nd, however, has no considerable improvement on the adiabatic temperature change. In contrast, the significance of Nd incorporation in Co-rich alloys (y = 1.03) is more evident. A stronger decrease in T_C (–38.19℃/f.u.Nd) and a monotonic improvement up to 6% in the adiabaticrntemperature change are observed.