The point groups of the crystals at room temperature were determined by means of X-ray diffraction and ferroelectric measurement.
根据x光衍射及铁电测量，确定了在室温时晶体的点群。
Four-dimensional point groups are deduced by generating normal three-dimensional point groups with certain restrictions which are unique for modulated structures.
在某些限制下，推广三维点群的概念，导出四维空间点群。
Four-dimensional point groups are deduced by generating normal three-dimensional point groups with certain restrictions which are unique for modulated structures.
在某些限制下，推广三维点群的概念，导出四维空间点群。
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