PHYSICAL-PROPERTIES OF NITROGENATED RFE11TI INTERMETALLIC COMPOUNDS (R=CE, PR AND ND) WITH THMN12-TYPE STRUCTURE
PHYSICAL-PROPERTIES OF NITROGENATED RFE11TI INTERMETALLIC COMPOUNDS (R=CE, PR AND ND) WITH THMN12-TYPE STRUCTURE
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DOI：
10.1016/0304-8853(94)90662-9
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发表时间：
1994-02-01
影响因子：
2.7
通讯作者：
TATAMI, K
中科院分区：
文献类型：
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作者：
AKAYAMA, M;FUJII, H;TATAMI, K
精心制备了具有ThMn₁₂型结构的富铁三元金属间化合物RFe₁₁Ti（R = Ce、Pr和Nd）及其氮化物RFe₁₁TiNₓ（x约为1.5）。通过金相和微观分析对它们进行表征后，我们研究了母体化合物及其氮化物的结构和磁性。氮化导致的晶格膨胀在Pr和Nd体系中主要沿c轴，而在Y体系中主要沿a轴。Ce体系的晶格膨胀是各向同性的，但体积膨胀最大，这表明Ce - 4f电子态在吸氮时发生显著变化。居里温度T(C)升高了200 K，Pr和Nd体系的T(C)达到约720 K。饱和磁化强度M(S)通过氮化大约增加10%，Pr和Nd体系在4.2 K时达到1.8 - 1.9 T，在300 K时达到1.5 T。各向异性场μ₀H(A)在4.2 K时估计大于20 T，在300 K时为7 T。根据计算的能带结构简要讨论了氮化后磁性的改善。在300 K下获得的结果表明，Pr和Nd氮化物在永磁应用方面很有前景。
Iron-rich ternary intermetallics RFe11Ti (R = Ce, Pr and Nd) with a ThMn12-type structure and their nitrides RFe11TiNx (x is similar to 1.5) were carefully prepared. After characterizing them by metallographic and microscopic analyses, we studied structural and magnetic properties of the mother compounds and their nitrides. The lattice expansion due to nitrogenation is mainly along the c-axis for the Pr and Nd systems, while that is mainly along the a-axis for the Y system. The lattice expansion of the Ce system is isotropic but the volume expansion is the largest, indicating that the Ce-4f electron state dramatically changes upon nitrogen uptake. The Curie temperature, T(C), increases by 200 K reaching T(C) is similar to 720 K for the Pr and Nd system. The saturation magnetization, M(S), increases approximately 10% by nitrogenation and reaches 1.8-1.9 T at 4.2 K and 1.5 T at 300 K for Pr and Nd systems. The anisotropy field, mu0H(A) is estimated to be more than 20 T at 4.2 K and 7 T at 300 K. The improvement of magnetic properties upon nitrogenation is briefly discussed in terms of the calculated band structure. The results obtained at 300 K indicate that the Pr and Nd nitrides are promising as permanent magnetic application.