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  • >What is the crystal structure of calcium fluoride?

    • What is the crystal structure of calcium fluoride?

    Release time：2024-04-17 10:44:32 | Information Source：UM OPTICS | Article Type：Original | Click：0

    The crystal structure of calcium fluoride, also known as fluorite type structure, is a face centered cubic structure. In this structure, cations (such as calcium ions) are densely packed in a cubic manner, while anions (such as fluoride ions) are filled in the tetrahedral voids, located at 1/4 and 3/4 of the diagonal of the face centered cubic lattice. This structure has a large vacancy at the center of the unit cell, with coordination numbers of 8 and 4 for positive and negative ions, respectively. In addition, calcium fluoride crystals belong to the equiaxed crystal system with a space group of Fm3m. Each unit cell contains 4 cations and 8 anions. Compounds of this structural type include ThO ₂, UO ₂, CeO ₂, BaF ₂, PbF ₂, SrF ₂, etc., all of which have large positive ion radii.
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