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Calcium compounds: calcium difluoride
The calcium in calcium difluoride formally is in the oxidation state 2.
Calcium difluoride
- Formula as often written: CaF2
- Hill system formula: Ca1F2
- CAS registry number: [7789-75-5]
- Formula weight: 78.075
- Class: fluoride
Synonyms
- calcium difluoride
- calcium(II) fluoride
- calcium fluoride
Physical properties
- Colour: white
- Appearance: crystalline solid
- Melting point: 1418°C
- Boiling point: 2533°C
- Density: 3180 kg m-3
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Element analysis
Element percentages for the elements in calcium difluoride
| Element |
% |
| Ca |
51.33 |
| F |
48.67 |
Synthesis
One way to make small amounts of calcium fluoride is by the neutralisation of chalk with hydrofluoric acid.
CaCO3(s) + 2HF(aq) → CaF2(s) + H2O(l) + CO2(g)
Solid state structure
- Geometry of calcium: 4 coordinate: tetrahedral
- Prototypical structure: CaF2 (fluorite)
Isotope pattern
What follows is the calculated isotope pattern for the CaF2 unit with the most intense ion set to 100%.
Formula: Ca1F2
mass %
78 100.0 __________________________________________________
79 0.0
80 0.7
81 0.1
82 2.2 _
83 0.0
84 0.0
85 0.0
86 0.2
References
The data on these compounds pages are assembled and adapted from the primary literature and several other sources including the following.
- R.T. Sanderson in Chemical Periodicity, Reinhold, New York, USA, 1960.
- N.N. Greenwood and A. Earnshaw in Chemistry of the Elements, 2nd edition, Butterworth, UK, 1997.
- F.A. Cotton, G. Wilkinson, C.A. Murillo, and M. Bochmann, in Advanced Inorganic Chemistry, John Wiley & Sons, 1999.
- A.F. Trotman-Dickenson, (ed.) in Comprehensive Inorganic Chemistry, Pergamon, Oxford, UK, 1973.
- R.W.G. Wyckoff, in Crystal Structures, volume 1, Interscience, John Wiley & Sons, 1963.
- A.R.West in Basic solid state chemistry Chemistry, John Wiley & Sons, 1999.
- A.F. Wells in Structural inorganic chemistry, 4th edition, Oxford, UK, 1975.
- J.D.H. Donnay, (ed.) in Crystal data determinative tables, ACA monograph number 5, American Crystallographic Association, USA, 1963.
- D.R. Lide, (ed.) in Chemical Rubber Company handbook of chemistry and physics, CRC Press, Boca Raton, Florida, USA, 77th edition, 1996.
- J.W. Mellor in A comprehensive treatise on inorganic and theoretical chemistry, volumes 1-16, Longmans, London, UK, 1922-1937.
- J.E. Macintyre (ed.) in Dictionary of inorganic compounds, volumes 1-3, Chapman & Hall, London, UK, 1992.
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