Dy_2(Fe_(1-x)Si_x)_(17)系列化合物内禀磁性及穆斯堡尔效应研究

Magenetic Properties and Mssbauer Study of The Dy 2(Fe 1- x Si x ) 17 Compounds

详细研究了Ｄｙ２（Ｆｅ１－ｘＳｉｘ）１７（ｘ＝０，００４，００８，０１２，０１６，０２０）系列化合物的晶格结构和内禀磁性。Ｘ射线衍射分析表明，Ｄｙ２（Ｆｅ１－ｘＳｉｘ）１７系列化合物呈现Ｔｈ２Ｎｉ１７结构相或Ｔｈ２Ｚｎ１７结构相，居里温度ＴＣ随ｘ的增大而增大，饱和磁化强度σｓ随ｘ的增加而减小。由穆斯堡尔谱分析得到，各Ｆｅ晶位的超精细场随ｘ的增加而减小。但４ｆ哑铃位减小最快。由实验结果可以看到。

The crystal and magenetic properties of Dy 2(Fe 1- x Si x ) 17 with x equal to 0 0, 0 04, 0 08, 0 10, 0 12, 0 16, 0 20 have been investigated with X ray diffraction and 57 Fe Mssbauer effects methods. They crystallize in the hexagonal Th 2Ni 17 type structure or Th 2Zn 17 type structure. With the increase of Si content, their curie temperatures increase, while their saturation magnetizations decrease. From the Mssbauer spectra data., it is found that the hyperfine field in all Fe crystal sites is weakened with Si content increasing and the 4f dumbell site decrease fastestly. From the experimental results, it can be seen that the effects of substituing Si for Fe is active.