Alumina
Properties
|
General
|
| Name |
Aluminium oxide
Aluminum oxide (US) |
| Chemical Formula |
Al2O3 |
| Appearance |
White crystalline powder or solid |
|
Physical
|
| Formula weight |
101.96 amu |
| Melting point at SP |
2303 K |
| Boiling point at SP |
3250 K |
| Density |
3.97 × 103 kg/m3 |
| Crystal structure |
Trigonal (hex) |
| Solubility |
Insoluble |
|
Thermochemistry
|
| ΔfH0liquid |
−1620.57 kJ/mol |
| ΔfH0solid |
−1675.69 kJ/mol |
| S0liquid, 1 bar |
67.24 J/mol·K |
| S0solid |
50.9 J/mol·K |
|
Safety
|
| Injestion |
Low hazard |
| Inhalation |
May cause irritation or lung damage |
| Skin |
Low hazard |
| Eyes |
Low hazard |
SI units were used where possible.
|
Aluminium oxide (also Aluminum oxide) (Al2O3) is a chemical compound of aluminium and oxygen. It can also be called alumina - although this name is obsolete it is still frequently used in the mining industry.
Aluminium oxide is the main component of the principal ore of aluminium (bauxite), and the main component of the gems ruby and sapphire.
Aluminium oxide is responsible for metallic aluminium's resistance to weathering. Metallic aluminium is very reactive with atmospheric oxygen, and a thin layer of aluminium oxide quickly forms on any exposed aluminium surface. This layer protects the metal from further oxidation.
Powdered aluminium oxide is frequently used as a medium for chromatography.
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