Electron microscopy
  
Calcium fluoride (CaF2)
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Table 1330a. Crystal structure of calcium fluoride (CaF2). 

  Parameter
Crystal structure Cubic crystal system, cF12. Based on fcc lattice with Ca at 000 and F at (1/4, 1/4, 1/4) and (3/4, 3/4, 3/4)
Atom coordinates First type of atom (Ca here): (0, 0, 0), (0, 1/2, 1/2), (1/2, 0, 1/2), (1/2, 1/2, 0)
Second type of atom (F here): (1/4, 1/4, 1/4), (1/4, 3/4, 3/4), (3/4, 1/4, 3/4), (3/4, 3/4, 1/4), (3/4, 3/4, 3/4), (3/4, 1/4, 1/4), (1/4, 3/4, 1/4), (1/4, 1/4, 3/4)
Space group Fm-3m (#225)
Lattice constant (a0) at 300 K 0.54629
Mismatch with Si (300 K) (%) +0.60

Table 1330b. Crystals with calcium fluoride structure.

Crystal
 Lattice constant (nm)

BaF2

 0.620

CaF2

 0.546

CdF2

 0.539

CeO2

 0.541
CmO2
 0.537

CoSi2

 0.536

HfO2

 0.512

Li2O

 0.462

Li2S

0.571
Mg2Pb
 0.684

Mg2Si

 0.639

Mg2Sn

 0.677

Na2S

 0.653

SrCl2

 0.698
UO2
 0.547
 

 

 

 
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