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Fabrication of Metastable Solid Solution in Rare Earth-Transition Metal Alloys, and Their Magentic Properties

稀土过渡金属合金亚稳态固溶体的制备及其磁性能

基本信息

批准号：
01550501
负责人：
ISHIO Shunji
金额：
$ 1.54万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Gd-Fe, Gd-B, C and (Gd, Tb-Fe)_<80>Si_<12>B_8 metastable solid solutions were prepared by rapidly quenching from melts. X-ray analysis, electron microscope observation, magnetic measurements, and Mossbauer spectroscopy were carried out to make clear the structure and magnetism of rare earth metal- transition metal metastable solid solutions.1. Gd_xFe_<1-x>X-ray structural analysis revealed that, while the hcp solid solution is formed at X<greater than or equal>0.7, the amorphous state is at 0.2<less than or equal>X<less than or equal>0.6. Both the amorphous alloy and hcp solid solution are ferrimagnet. Curie temperature Tc of the solid solution (X<greater than or equal>0.7) increases with an decrease of X, and becomes close to Tc of the amorphous state (0.2<les2. Gd_<chi>B_<1-chi>While the substitutional solid solution is formed at X<greater than or equal>0.8, the amorphous state is at X<0.8. The lattice constant C decreases with a decrease of X in the solid solution. The solid solutio … More n is a ferromagnet, whose Curie timperature Tc is close to Tc of hcpGd. The amorphous state is also ferromagnet, whose Curie temperature Tc is lower than that of hcpGd because of a random s3. (Gd_<chi>Fe_<1-x>)_<80>Si_<12>B_8The amorphous phase is formed at 0.7<less than or equal>X<less than or equal>1.0. Exchange interactions J between Gd magnetic moments are considered to distribute widely from negative to positive because of a random structure and an oscillating RKKY interaction. This distribution of J causes an instability of ferromagnetism. Fe magnetic moments in (Gd_<1-x>Fe_x)_<80>Si_<12>B_8 strongly couple with neighboring near Gd magnetic moments, make Gd-Gd interactions positive and stabilize a ferromagnetism. Mossbauer spectroscopy showed that an internal magnetic field is about 100kOe at X=0.7, indicating an apparent decrease of magnetic moment from 2.2mu_B for alphaFe to about 1.0mu_B for X=0.7. In (Tb_<chi>Fe_<1-x>)_<80>Si_<12>B_8, the amorphous phase is formed in 0.7<less than or equal>X<less than or equal>1.0. The amorphous alloys show a spin-glass like behavior giant local magnetic anisotropy of Tb atoms. Less

用熔体快淬法制备了Gd-Fe，Gd-B，C和（Gd，Tb-Fe）_<80>Si_<12>B_8亚稳固溶体。通过X射线分析、电子显微镜观察、磁性测量和穆斯堡尔谱等手段，研究了稀土金属-过渡金属亚稳固溶体的结构和磁性. Gd_xFe_<1-x>x的X射线结构分析表明，当X = 0.7时，形成hcp固溶体<greater than or equal>，而当x = 0.2 × 0.6时，形成非晶态<less than or equal><less than or equal>。非晶合金和hcp固溶体都是铁磁材料。固溶体（X 0.7）的居里温度Tc<greater than or equal>随着X的减小而增加，并且变得接近于非晶态的Tc（0.2 Gd_<chi>B_<1-chi>在X <0.8时形成替位固溶体<greater than or equal>，而在X<0.8时为非晶态。在固溶体中，晶格常数C随着X的减小而减小。固体溶液 ...更多信息 n为铁磁体，其居里温度Tc与hcpGd的Tc接近。非晶态也是铁磁体，其居里温度Tc低于hcpGd，因为随机的s3。(Gd在<chi><1-x><80><12>0.7 × 1.0 ~（-1）范围内形成非晶相<less than or equal><less than or equal>。Gd磁矩之间的交换相互作用J被认为是从负到正的广泛分布，因为随机结构和振荡的RKKY相互作用。J的这种分布导致铁磁性的不稳定性。（Gd_<1-x>Fe_x）_<80>Si_<12>B_8中Fe的磁矩与邻近的Gd磁矩强耦合，使Gd-Gd相互作用为正，稳定了铁磁性。穆斯堡尔谱表明，在X=0.7时，内部磁场约为100 kOe，表明磁矩从α Fe的2.2 μ B明显降低到X=0.7时的约1.0 μ B。在（Tb_<chi>Fe_<1-x>）_<80>Si_<12>B_8中，非晶相的形成尺寸为0.7 <less than or equal>× <less than or equal>1.0。非晶合金表现出类似自旋玻璃的行为，Tb原子具有巨大的局域磁各向异性。少