Electron diffraction covering a wide angular range from Bragg diffraction to small-angle diffraction.
Electron diffraction covering a wide angular range from Bragg diffraction to small-angle diffraction.
复制标题
电子衍射覆盖从布拉格衍射到小角衍射的宽角度范围。
DOI：
10.1093/jmicro/dfy019
复制
发表时间：
2018
期刊：
影响因子：
1.8
通讯作者：
S. Mori
中科院分区：
文献类型：
--
作者：
H. Nakajima;A. Kotani;K. Harada;S. Mori
我们构造了一个电子光学系统，通过调节中间透镜中的电流来研究在物镜透镜关闭的情况下的布拉格衍射（晶格面，10-2至10-3 rad）。交叉位于选定区域的孔径平面上。因此，暗场成像可以通过使用选定区域孔径来选择布拉格衍射点来执行。在不激发物镜透镜的情况下，摄像机长度可以控制在0.8-4 m的范围内。此外，我们可以观察到磁场依赖的电子衍射使用物镜透镜在弱激发条件下。用于布拉格衍射的衍射模式可以容易地切换到具有大于100 m的相机长度的小角度电子衍射模式。我们提出这种实验方法来获取电子衍射图案，描绘了一个广泛的角度范围从10-2到10-7弧度。该方法被应用于分析三种不同的磁性材料，即BaFe 10.35Sc 1.6Mg 0.05O 19的单轴磁性结构，Ni-Mn-Ga合金的马氏体，和Ba0.5Sr 1.5Zn2Fe 12 O 22的螺旋磁性结构的磁性微结构。
We construct an electron optical system to investigate Bragg diffraction (the crystal lattice plane, 10-2 to 10-3 rad) with the objective lens turned off by adjusting the current in the intermediate lenses. A crossover was located on the selected-area aperture plane. Thus, the dark-field imaging can be performed by using a selected-area aperture to select Bragg diffraction spots. The camera length can be controlled in the range of 0.8-4 m without exciting the objective lens. Furthermore, we can observe the magnetic-field dependence of electron diffraction using the objective lens under weak excitation conditions. The diffraction mode for Bragg diffraction can be easily switched to a small-angle electron diffraction mode having a camera length of more than 100 m. We propose this experimental method to acquire electron diffraction patterns that depict an extensive angular range from 10-2 to 10-7 rad. This method is applied to analyze the magnetic microstructures in three distinct magnetic materials, i.e. a uniaxial magnetic structure of BaFe10.35Sc1.6Mg0.05O19, a martensite of a Ni-Mn-Ga alloy, and a helical magnetic structure of Ba0.5Sr1.5Zn2Fe12O22.
影响因子：
4.6
作者：
Basith, M. A.;McVitie, S.;McCord, J.
通讯作者：
McCord, J.
透射电子显微镜
DOI：
10.1007/978-3-319-26651-0_3
发表时间：
2016
期刊：
--
影响因子：
--
作者：
Burke M
通讯作者：
Burke M