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最近,Coey J.M.D.和Sun Hong等发现了一种具有优异内禀磁特性的化合物Sm_2Fe_(17)Ny,其H_A=14 T Tc=475℃,μ_oM_s=1.54 T。用机械合金化法制得了内禀矫顽力_iH_c=23.5 kA/cm(30kOe)的各向同性磁体,该磁体具有较好的温度特性,例如,在200℃时,其_iH_c=8.8 kA/cm(11.0kOe)。该化合物有一个致命的弱点,就是在650℃附近完全分解为SmN和α-Fe的混合物。因而限制了用烧结法和热形变法制备各向异性磁体
Recently, Coey J.M.D. and Sun Hong et al. Found a compound Sm_2Fe_ (17) Ny with excellent intrinsic magnetic properties with H_A = 14 T Tc = 475 ° C and μ_oM_s = 1.54T. An isotropic magnet having an intrinsic coercivity of _iH_c = 23.5 kA / cm (30 kOe) was obtained by a mechanical alloying method having good temperature characteristics such as _iH_c = 8.8 kA / cm (11.0 kOe). The compound has a fatal weakness in that it completely decomposes to a mixture of SmN and α-Fe near 650 ° C. Thus limiting the use of sintering and thermal deformation of anisotropic magnets