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Nitrided and Carbided Magnets

机译:氮化和碳化磁铁

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In this article, we review our recent studies on new rare-earth intermetallic compounds including the Gas Si substituted 2:17-type compounds, their nitrides, carbides, and the Sm_3 (Fe,Ti)_(29)N_5 compounds. Much of our recent work is focused on the Sm_2(Fe,Ga)_(17)C_x alloyslvhere we used melt spinning and subsequent annealing to obtain high coercivity. The highest coercivity obtained so far was In Sm_2Fe_(14)Ga_3C_(2.5) with a value of 12.8 kOe at room temperature. The off-stoichiometrie Sm_2Fe_(14-x)Co_xSi_2N_y. nitrides maintain the Th_2Zn_(17-type_ structure but with a unit-cell expansion triangle ipenVV up to 5 percent compared to the host materials. The Sm_2Fe_(14-x)Co_xSi_2C_z carbides maintain the Th_2Zn_(17-type) structure when z = 1 and transform to the BaCd_(11-type) structure when z = 2. A very large anisotropy field with an applied magnetic field (H_a) value of 227 kOe for Sm_2Fe_(14)Si_2N_(2.6) and 276 kOe for Sm_2Fe_(10)Co_4Si_2N_(2.3) is observed at low temperature (1.5 K). The Sm_3(Fe,TI)_(29)N_5 compound and its nitrides show very interesting magnetic properties. Both of these compounds exhibit ferromagnetic ordering with Curie temperature (T_c) of 486 and 750 K, respectively. The room temperature saturation magnetization is 119 eirni/g for the parent compounds and 145 emu/g for the nitrides. The easy magnetization direction changes from planar to uniaxial upon nitrogena-tion. The anisotropy field for the nitrides is 12 T at room temperature and 25 T at 4.2 K.
机译:在本文中,我们回顾了我们对新型稀土金属间化合物的最新研究,这些化合物包括Gas Si取代的2:17型化合物,其氮化物,碳化物和Sm_3(Fe,Ti)_(29)N_5化合物。我们最近的工作大部分集中在Sm_2(Fe,Ga)_(17)C_x合金上,在这里我们使用熔体纺丝和随后的退火以获得高矫顽力。到目前为止,获得的最高矫顽力是In Sm_2Fe_(14)Ga_3C_(2.5)在室温下的值为12.8 kOe。化学计量比为Sm_2Fe_(14-x)Co_xSi_2N_y。氮化物保持Th_2Zn_(17型)结构,但与主体材料相比具有高达5%的晶胞扩展三角形ipenVV。当z = 1时,Sm_2Fe_(14-x)Co_xSi_2C_z碳化物保持Th_2Zn_(17型)结构。并在z = 2时转换为BaCd_(11型)结构。对于Sm_2Fe_(14)Si_2N_(2.6),施加的磁场(H_a)值为227 kOe,对于Sm_2Fe_(10),具有276 kOe的非常大的各向异性场在低温(1.5 K)下观察到Co_4Si_2N_(2.3)。Sm_3(Fe,TI)_(29)N_5化合物及其氮化物显示出非常令人感兴趣的磁性能。这两种化合物都显示出居里温度(T_c)为铁磁性有序分别为486 K和750 K.室温饱和磁化强度对于母体化合物为119 eirni / g,对于氮化物为145 emu / g。氮化后易磁化方向从平面变为单轴,氮化物的各向异性场在室温下为12 T,在4.2 K下为25T。

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