Tb0．3Dy0．6Pr0．1(Fe1-xAlx)1．95合金的磁性、磁致伸缩和穆斯堡尔谱研究  

Magnetism,magetostriction,and Mssbauer effect studies of Tb_(0.3)Dy_(0.6)Pr_(0.1)(Fe_(1-x)Al_x)_(1.95) alloys

作　　者：郑小平[1,2] 张佩峰[1,3] 李发伸[3] 郝远[2] 

机构地区：[1]兰州城市学院电子信息科学与技术研究所,兰州730070 [2]兰州理工大学甘肃省有色金属新材料重点实验室,兰州730050 [3]兰州大学磁学与磁性材料教育部重点实验室,兰州730000

出　　处：《物理学报》2009年第8期5768-5772,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10574059);甘肃省自然科学基金(批准号:0710RJZA074);甘肃省教育厅科研计划(批准号:0711B-04);教育部科学技术研究计划重点项目(批准号:209127);兰州交通大学“青蓝”人才计划资助的课题~~

摘　　要：系统研究了室温下Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95(x=0.05,0.1,0.15,0.2,0.25,0.3)合金中元素Al替代Fe对结构、磁性、磁致伸缩性能和自旋重取向的影响.测量结果发现,x<0.2时Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95合金基本上是纯的单相,x=0.2时出现其他杂相,杂相随Al替代量的增加不断增多.随Al替代量x的增加,点阵常数a接近于线性增大,Curie温度TC逐渐下降,而矫顽力Hc急剧下降.振动样品磁强计(VSM)测量发现,磁化强度M随Al替代量x的变化较为复杂.VSM计和磁致伸缩效应测量共同表明,少量Al的替代有利于降低磁晶各向异性,而且随着Al替代量x的增多磁致伸缩系数快速减小,x>0.15时巨磁致伸缩效应消失.穆斯堡尔效应研究发现,随Al含量的增加Tb0.3Dy0.6Pr0.1(Fe1-xAlx)1.95合金中易磁化轴可能在{110}面逐渐偏离了立方晶体的主对称轴,发生自旋重取向,从而引起合金宏观磁性、磁致伸缩性能的变化.The effects of Al substitution for Fe on the structure, the magnetism, the magnetostriction, the anisotropy and the spin reorientation of a series of Tb0.3 Dy0.6 Pr0.1 （ Fe1-x Alx ）1.95 alloys （ x = 0.05,0.1,0.15,0.2,0.25,0.3） at room temperature are investigated. It is found that the compositions of Tb0.3 Dy0.6 Pr0.1 （ Fe1 - x Alx ）1.95 substantially retain MgCu2-type C-15 cubic Laves phase structure when x 〈 0. 2, other phase exists when x = 0. 2 and the mixture phase increases with x increasing. The lattice constants increase linearly, Curie temperature decreases gradually and the coercive force decreases sharply with x increasing. The vibrating sample magnetormeter measurements show that the relationship between magnetization and substitution x is rather ambiguous. The magnetostriction of the Tb0.3 Dy0.6Pr0.1 （Ee1-xAlx ）1.95 alloys decreases drastically with x increasing and the magnetostrictive effect disappears when x 〉 0.15. However, a small amount of Al substitution is beneficial to a decrease in magnetocrystalline anisotropy. The analysis of the Moessbauer spectra indicates that the easy magnetization direction in the { 110 } plane deviates slightly from the main axis of symmetry with the increase of Al concentration x, namely spin reorientation takes place, thereby leading to the change of macroscopical magnetism and magetostriction.

关 键 词：磁致伸缩 立方Laves相 自旋重取向 穆斯堡尔谱 

分 类 号：O482.5[理学—固体物理]