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Not all crystals are equally crystalline. There will often be impurities, as well as ionic & covalent involving molecules can generate vastly distinctive constructions from exactly the same content. An incredible example of this are diamonds and graphene.①压电效�?在机械力(压力或拉�?作用下，水晶单晶体的两端会产生电�

The luminescence of nanocrystalline ZnS : Mn2+ in fact demonstrates a brief decay time element (∼one hundred ns), and also an extended (ms) decay time is observed. The quick decay time is ascribed to a defect-linked emission of ZnS, and isn't with the decay from the transition in the Mn2+ impurity. The changeover from the Mn2+ provides a `ordinar