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The dynamical electron scattering effects by a hexagon-prism β-Si3N4 whisker were investigated. The 002 dark field images of the wedges of the whisker along [110] direction showed sinusoidal fringes, in which there existed great differences in fringe period under two- and N-beam conditions. Fine structures of the corresponding diffraction spots under two-beam condition were also very different from those under many-beam condition. Such dynamical scattering effects were analyzed quantitatively. 相似文献
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The dynamical electron scattering effects by a hexagon-prism β-Si3N4 whisker were investigated. The 002 dark field images of the wedges of the whisker along [110] direction showed sinusoidal fringes, in which there existed great differences in fringe period under two- and N-beam conditions. Fine structures of the corresponding diffraction spots under two-beam condition were also very different from those under many-beam condition. Such dynamical scattering effects were analyzed quantitatively. 相似文献
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用选区电子衍射(SAED)和高分辨电子显微术(HREM)研究钙稀土氟碳酸盐矿物及其衍生多晶体结构,发现三种不同的氟碳铈矿(B)与直氟碳钙铈矿(S)具8:6新规则混层结构(B_6S_6-Ⅰ、B_8S_6-Ⅱ和S_8S_6-Ⅲ),确定了各自的晶体结构类型、晶胞参数、堆垛模式及晶体化学式等。高分辨像的观察分析,揭示出三种B_8S_6规则混层结构中的Ce-F离子层以及两个Ce-F离子层之间的CO_3离子组具有不同的排列方式,观察和讨论了上述规则混层结构中的无序夹层及堆垛层错等非均匀结构现象 相似文献
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