Fluorite - Calcium fluoride - CaF2
CaF2 (Fluorite) has an arrangement where the fluorides are 4 coordinate and the Calcium is eight coordinate. If the cations have CN=4 and the anions have CN=8 this is described as an antifluorite structure, examples include Li2O and Na2O. Generally, if the radius ratio r-/r+ exceeds ~1.37 then a rutile rather than fluorite structure is favoured.

Complexes that adapt this structure include..
CdF2, HgF2, SrF2, PbF2, BaF2 and HfO2.
Information is available to show how the individual structural pages were created.
Return to the structure of binary salts introductory page.

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Copyright © 2006 by Robert John Lancashire, all rights reserved.

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The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created June 2006. Links checked and/or last modified 20th June 2006.
URL http://wwwchem.uwimona.edu.jm/courses/fluoriteJ.html