Magnetic analysis of RE{sub}80Fe{sub}15C{sub}5 (Re = Nd, Pr) and Nd{sub}80Fe{sub}15(B{sub}(1-x)C{sub}x){sub}5 (0.85≤x≤1.00) alloys

摘要

The temperature dependence of saturation magnetization, σ{sub}s intrinsic coercivity, iHc, and ac-magnetic susceptibility,χ{sub}(ac), from 4.2 to 300 K were studied for RE{sub}(80)Fe{sub}(15)C{sub}5 samples. The magnetic analysis of Nd{sub}(80)Fe{sub}(15)(B{sub}(1-x)C{sub}x){sub}5 alloys with very low B-content (0.85≤x≤1.00) was also carried out. The latter confirms that the phase D1 only forms for x = 1.00 after annealing at 600°C. A comparison of the χ{sub}(ac)(T) curves for RE{sub}(80)Fe{sub}(15)X{sub}5, X = B, C, suggests that phase D{sub}1 is different from the ternary carbide RE{sub}2Fe{sub}(14)C. This contrasts with the results observed for RE{sub}(80)Fe{sub}(15)B{sub}5 (RE = Nd, Pr) samples where the annealing at 600°C transforms A{sub}1 into RE{sub}2Fe{sub}(14)B. With the decrease of the temperature the coercive fields of RE{sub}(80)Fe{sub}(15)C{sub}5 alloys strongly increases (31.2 kOe for RE = Nd and 39.3 kOe for RE = Pr at 10K) confirming the high magnetocrystalline anisotropy of the D{sub}1 phase.