WebElements Periodic Table of the Elements | Hafnium

Hafnium compounds: hafnium dioxide

The hafnium in hafnium dioxide formally is in the oxidation state 4.

Hafnium dioxide

Formula as often written: HfO₂
Hill system formula: Hf₁O₂
CAS registry number: [12055-23-1]
Formula weight: 210.489
Class: oxide

Synonyms

hafnium dioxide
hafnium(IV) oxide
hafnium oxide

Physical properties

Colour: white
Appearance: crystalline solid
Melting point: 2774°C
Boiling point:
Density: 9680 kg m^-3

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Element analysis

Element percentages for the elements in hafnium dioxide
Element	%
Hf	84.80
O	15.20

Synthesis

Not available

Solid state structure

Geometry of hafnium:
Prototypical structure:

Crystal structure of hafnium dioxide

Isotope pattern

What follows is the calculated isotope pattern for the HfO₂ unit with the most intense ion set to 100%.

Formula: Hf₁O₂

mass  %
206   0.5 
207   0.0 
208  14.8 _______
209  52.8 __________________________
210  77.6 _______________________________________
211  39.0 ____________________
212 100.0 __________________________________________________
213   0.2 
214   0.4

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.