Nakai I, Murakami Y, Shibai Y
Department of Electrical and Electrical Engineering, Tottori University, Japan.
J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):812-4. doi: 10.1107/s0909049500018276.
We report changes in the structure and the electronic states of YCu2 during mechanical alloying. The x-ray diffraction shows that milling for about 60 h transforms mixture of elemental powders of Y and Cu into an amorphous alloy. We have measured the x-ray absorption near edge structure (XANES) spectra of mechanically alloyed YCu2 at Cu K and Y K edges at various milling time. The pre-edge peak near the Cu K threshold grows remarkably and its central energy decreases with increasing the milling time. The absorption near the Y K threshold, on the other hand, decreases with milling time. We discuss these features of XANES spectra in connection with the phase transformation from the crystalline to amorphous states.
我们报道了机械合金化过程中YCu₂的结构和电子态变化。X射线衍射表明，研磨约60小时可将Y和Cu的元素粉末混合物转变为非晶合金。我们测量了在不同研磨时间下机械合金化的YCu₂在Cu K和Y K边缘的X射线吸收近边结构（XANES）光谱。Cu K阈值附近的前缘峰显著增长，其中心能量随着研磨时间的增加而降低。另一方面，Y K阈值附近的吸收随研磨时间减少。我们结合从晶态到非晶态的相变来讨论XANES光谱的这些特征。
