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首页> 外文期刊>Crystallography reports >Electron diffraction study of lizardite 1 T with stacking faults
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Electron diffraction study of lizardite 1 T with stacking faults

机译：具有堆垛层错的蜥蜴石1 T的电子衍射研究

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The stacking faults observed in the structure of the mineral lizardite 1T belonging to the polytype group A are investigated using the digital oblique-texture electron diffraction patterns, difference Fourier-potential maps, and model diffraction patterns obtained for this compound. Numerical simulation of the diffraction profiles along the first (the 02l and 11l reflections) and second (the 20l and 13l reflections) ellipses in the oblique-texture electron diffraction patterns is performed for finite sequences of ten layers with the use of the Markovian statistical model in the quasi-homogeneous approximation. The specific features of the intensity distributions along the first and second ellipses are associated with the manifestation of translational (displacements of the layers by ±b/3) and orientational (rotations of the layers through an angle of 180°) defects of the layer stacking, respectively. For both ellipses, the experimentally observed intensity distributions are in the best agreement with the diffraction profiles calculated for stacking faults at a content of approximately 25%, the short-range order parameter S = 1, and the maximum degree of ordering in the layer alternation. It is demonstrated that the irregularities revealed in the layer alternation in the structure of lizardite 1T (which is characterized by an identical orientation of the adjacent layers) arise from layer displacements by ±b/3 and, to a considerable extent, from the formation of sequences with opposite orientations of the adjacent layers. As a result, the structure of lizardite 1T nanocrystals involves a combination of layer sequences that are typical of structures belonging to the polytype groups A and D.
机译：使用数字斜纹电子衍射图，差分傅里叶势图和该化合物获得的模型衍射图，研究了属于多型群A的矿物蜥蜴石1T结构中观察到的堆积缺陷。使用马尔可夫统计模型对十层有限序列进行了斜纹理电子衍射图中沿第一（02l和11l反射）和第二（20l和13l反射）椭圆的衍射轮廓的数值模拟。在准齐次逼近中沿第一和第二椭圆的强度分布的特定特征与层堆叠的平移缺陷（层的位移为±b / 3）和取向缺陷（层的旋转角度为180°）相关。 ， 分别。对于两个椭圆，实验观察到的强度分布与为堆积断层计算的绕射剖面的含量大约为25％，短程有序参数S = 1以及层交替的最大有序度与衍射图谱最吻合。事实证明，蜥蜴石1T的结构中层交替显示出的不规则性（其特征是相邻层的方向相同）是由于层位移±b / 3引起的，并且在很大程度上是由于形成了相邻层方向相反的序列。结果，蜥蜴石1T纳米晶体的结构涉及层序列的组合，这些层序列是属于多型组A和D的典型结构。

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