摘要
当x<0.7时,YTi(Fe_(1-x)Ni_x)_(11)可形成单相的ThMn_(12)型四方结构,空间群14/mmm。本文研究了以Ni原子代换Fe原子时,对饱和磁矩、磁晶各向异性和居里温度的影响。通过代换研究,并讨论了Fe原子和Ni原子在稀土化合物中所表现的两种不同的特性。稀土-铁(R-Fe)金属间化合物的磁性依赖于Fe-Fe近邻原子的间距和数目;而R-Ni金属间化合物的磁性取决于稀土金属传导电子对Ni的3d能带的影响。为进一步确证这两种原子在稀土化合物中的不同特点,对YTi(Fe_(1-x)Ni_x)_(11)的热膨胀反常行为进行了研究,并用交换作用与原子间距的依赖关系解释了所观测到的反常热膨胀。
The compounds YTi (Fe_(1-x)Ni_x)_(11) are found to crystallize in the ThMn_(14)-type tetragonal structure (space group 14/mmm) when x<0.7. The substitution effects of Fe by Ni on saura-tion moment, magnetocrystalline anisotropy and Curie temperature have been investigated. On the basis of the substitution effects, the magnetic behavior of Fe and Ni atoms in rare earth compounds have been discussed. For the Fe compounds, the magnetic properties are mainly determined by the Fe-Fe interatomic distances and the number of Fe nearest neighbors, whereas for the Ni compounds the magnetic properties are determined by the conduction electron transfer from the rare earth atom to the 3d band of Ni. In order to confirm the different behavior between Fe and Ni compounds, the anomalous thermal expansion of YTi (Fe_(1-x) Ni_x)_(11) has been studied and explained in terms of the interatomic distance dependence of exchange interaction between Fe atoms.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第9期1429-143,共1页
Acta Physica Sinica
