Hafnium(IV) oxide

Hafnium(IV) oxide is the inorganic compound with the formula HfO
2. Also known as hafnium dioxide or hafnia, this colourless solid is one of the most common and stable compounds of hafnium. It is an electrical insulator with a band gap of 5.3~5.7 eV. Hafnium dioxide is an intermediate in some processes that give hafnium metal.

Hafnium(IV) oxide
Names
IUPAC name
Hafnium(IV) oxide
Other names
Hafnium dioxide
Hafnia
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.818
EC Number
  • 235-013-2
UNII
  • InChI=1S/Hf.2O Y
    Key: CJNBYAVZURUTKZ-UHFFFAOYSA-N Y
  • InChI=1/Hf.2O/rHfO2/c2-1-3
    Key: CJNBYAVZURUTKZ-MSHMTBKAAI
  • O=[Hf]=O
Properties
HfO2
Molar mass 210.49 g/mol
Appearance off-white powder
Density 9.68 g/cm3, solid
Melting point 2,758 °C (4,996 °F; 3,031 K)
Boiling point 5,400 °C (9,750 °F; 5,670 K)
insoluble
−23.0·10−6 cm3/mol
Hazards
Flash point Non-flammable
Related compounds
Other cations
 Titanium(IV) oxide
Zirconium(IV) oxide
Related compounds
 Hafnium nitride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Hafnium(IV) oxide is quite inert. It reacts with strong acids such as concentrated sulfuric acid and with strong bases. It dissolves slowly in hydrofluoric acid to give fluorohafnate anions. At elevated temperatures, it reacts with chlorine in the presence of graphite or carbon tetrachloride to give hafnium tetrachloride.

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