摘要
利用 X射线衍射的方法及磁性测量手段研究了 R2 Fe17- x Crx(R=Y,Dy,x 3 )化合物 ,给出了其居里点的变化情况 ,即随 x的增大 ,居里温度增大 ,在 x近似为 1 .0时达到最大值 .利用分子场理论计算了磁交换作用系数并从磁交换作用出发 ,对其居里温度的变化情况进行了分析 .
The structural and magnetic properties of R 2Fe 17 x Cr x (R=Y, Dy, x 3) compounds are investigated by X-ray and magnetic measurements. The magnetic coupling constants of R 2Fe 17 x Cr x (R=Y, Dy, x 3) compounds are calculated from the molecular field model. According to the results of the calculation,chromium concentration dependence of both T c and magnetic coupling constant of R 2Fe 17 x Cr x (R=Y, Dy, x 3) compounds are discussed.
基金
天津市教委高校发展基金资助项目!(990 314)
关键词
金属间化合物
居里温度
磁交换耦合
稀土元素
intermetallic compound
Curie temperature
molecular field model
magnetic coupling constant
