Hafnium(IV) oxide
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| Hafnium(IV) oxide | |
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| General | |
| Other names | hafnium dioxide, hafnia |
| Molecular formula | HfO2 |
| Molar mass | 210.49 g/mol |
| Appearance | white odorless powder |
| CAS number | [12055-23-1] |
| Properties | |
| Density and phase | 9.68 g/cm3, solid |
| Solubility in water | insoluble |
| Melting point | 2758°C |
| Boiling point | 5400°C |
| Vapor density | 9.68 (20°C) |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |    |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Hafnium dioxide (HfO2) or hafnia is a hafnium oxide. It is used in optical coatings, among other things.
Hafnium(IV) oxide reacts with strong acids and strong bases.
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