论文部分内容阅读
提出利用分子场近似结合中子衍射或Ｘ射线衍射的实验结果，计算Ｒ２Ｆｅ１７型稀土过 渡族化合物中的稀土磁矩与过渡族磁矩之间的交换耦合常数的方法．计算了 Ｄｙ２Ｆｅ１７－ｘＡｌｘ （ｘ＝２，３，４，５，６，７，８）化合物中的稀土磁矩与过渡族磁矩之间的交换耦合常数－ＪＲＴ／ｋ， 结果分别为７，７７ Ｋ，７．２７ Ｋ，７．３９ Ｋ，８．６２ Ｋ，８．６４Ｋ，９．５２ Ｋ，１０．３４ Ｋ．其中对ｘ＝５，６， ７，８的化合物计算结果与高场测量的实验值８．７７ Ｋ，９．２５ Ｋ，１０．１Ｋ，１０．９Ｋ符合得较好． 说明从分子场理论出发，利用Ｘ射线衍射或中子衍射的结果更细致地考虑一些替代的细 节，计算稀土过渡族化合物中的稀土（Ｒ）磁矩与过渡族（Ｔ）磁矩之间的交换耦合常数是 一种可取的方法．
A new method to calculate the exchange coupling constants between the rare earth magnetic moment and the moment of transitional group in the R2Fe17 type rare earth transition metal is proposed based on the experimental results of molecular field approximation combined with neutron diffraction or X-ray diffraction. The exchange coupling constants (JRT / k) between the magnetic moment of rare earth and the moment of transition group in Dy2Fe17-xAlx (x = 2,3,4,5,6,7,8) compounds were calculated and the results were 7,77 K, 7.27 K, 7.39 K, 8.62 K, 8.64 K, 9.52 K, 10.34 K. Among them, the calculated results for compounds with x = 5, 6, 7, and 8 are in good agreement with the experimental values of 8.77 K, 9.25 K, 10.1 K and 10.9 K for high field measurements. It is illustrated that from the molecular field theory, some alternative details are considered in more detail by using the results of X-ray diffraction or neutron diffraction and the difference between the rare earth (R) magnetic moment and the transition (T) magnetic moment in the rare earth transition metal compound Exchange coupling constant is a desirable method.