The selected area diffraction patterns from the phase show a fivefold symmetry of a qua-sierystalline structure.
这个相的选区电子衍射花样显示出准晶体结构的五次对称性。
Acoording to the crystal symmetry, diffraction geometry and the diffraction laws, the complicated divergent beam X-ray diffraction has been studied.
根据晶体的对称性、衍射几何和衍射规律，研究了复杂的发散X射线晶体衍射。
The crystallographic problems of two-dimensional crystal, such as the matrix expression, the symmetry and the systematic absence law of the crystal's X-ray diffraction, are studied.
对二维晶体的矩阵表示、对称性及其对X射线衍射的系统消光规律进行了研究，得到并证明了二维晶体的矩阵表示的二个定理和二维晶体对X射线衍射的系统消光定理。
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