Abstract
AbstractThe structural transition of CaF2 nanocrystals was studied by in situ high pressure synchrotron radiation X‐ray diffraction measurements up to about 46.5 GPa at ambient temperature. A pressure‐induced fluorite structure (Fm3m) to orthorhombic PbCl2‐type structure (Pnma) transition starts at 14.0 GPa, and phase transition is sluggish. The orthorhombic phase of nanocrystalline CaF2 is stable up to 46.5 GPa. The enhancement of transition pressure in CaF2 nanocrystals as compared with the corresponding bulk material is mainly caused by the surface energy difference between the phases involved.
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