摘要
通过室温下 Tb0 .3 Dy0 .7(Fe1-x Alx) 1.95(x=0 ,0 .0 5和 0 .10 )合金的晶体结构、磁致伸缩、电阻率、抗压强度和穆斯堡尔谱的调查 ,研究了金属 Al替代 Fe对磁性能、电性能、机械性能和自旋重取向的影响 .测量结果发现 ,对于 Tb0 .3 Dy0 .7(Fe1-x Alx) 1.95系统 ,金属 Al的引入对晶体结构没有影响 ,其仍然保持 Mg Cu2 型的立方 L aves相结构 ,晶格常数随 Al含量的增多而增大 ;随着 Al含量的增加 ,10 MPa压应力作用下的磁致伸缩在低场下 (H≤ 4 0 k A/ m)有小幅增加 ,高场下迅速减小 ,而且易趋于饱和 ,说明引入 Al有助于减小磁晶各向异性 ;电阻率随 Al含量的增加提高了 2～ 3倍 ;抗压强度接近于线性增大 ;平均超精细场随 Al含量 x的增加而降低 ,易磁化轴方向经历了[111]→ [u v0 ]→ [u u w]的转变 ,出现了自旋重取向 .
By using the result of X ray diffraction, standard strain gauge measurement and M o¨ ssbauer spectra, the effects of Al in substitution for Fe on the structure, the properties and spin reorientation of Tb 0 3 Dy 0 7 (Fe 1 x Al x ) 1 95 have been studied. It is found that all alloys of Tb 0 3 Dy 0 7 (Fe 1 x Al x ) 1 95 retain the C 15 cubic Laves phase structure and the lattic constants increase with higher Al contents. Al containing compounds possess slightly larger saturation magnetostriction in a low field and lower anisotropy compared with higher Al free material. As Al increases, magnetostriction decreases rapidly in a high field, and its resistivity and anti press strength increase fairly. From the M o¨ ssbauer spectra, the average hyperfine field decreases with higher Al content and the presence of the spin reorientation has been observed due to the substitution of Al for Fe in Tb 0 3 Dy 0 7 (Fe 1 x Al x ) 1 95 system.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第4期31-35,共5页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金 (19835 0 5 0 )资助项目
