Effect of Scattering Angle on Energy Loss Near-Edge Structure of h-BN
Effect of Scattering Angle on Energy Loss Near-Edge Structure of h-BN
复制标题
散射角对h-BN近边缘结构能量损失的影响
DOI：
10.2320/matertrans1989.41.555
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Oikawa
中科院分区：
文献类型：
--
作者：
Yoon;Y. Murakami;D. Shindo;T. Oikawa
利用透射电子显微镜（TEM）和电子能量损失谱（EELS）对六方氮化硼（h-BN）中B-K边的角度依赖性进行了定量表征。已经观察到两个不同的值的收集角，0.78和4.2 mrad的峰值比上的散射角的依赖关系。在这些条件下，π * /σ * 的峰值比随散射角的增大而减小，直到与布拉格角一样大。当角度接近基波反射时，峰值比再次增加，这可能归因于布拉格反射的弹性散射效应。用DV-Xa方法估算的峰比证实了能量损失谱中峰比的变化。
Angular dependence of the B-K edge in hexagonal BN (h-BN) has been quantitatively characterized using transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS) in terms of the ratio of π * and σ * peaks. The dependence of the peak ratio on the scattering angle has been observed with two different values of the collection angle, 0.78 and 4.2 mrad. Under these conditions, the peak ratio of π * /σ * decreases with the increase of the scattering angle up to as much as the Bragg angle. As the angle approaches the fundamental reflection, the peak ratio re-increases, which may be attributable to the elastic scattering effect on the Bragg reflection. A change of the peak ratio in energy-loss spectra has been confirmed by the calculated peak ratio estimated by DV-Xa method.