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| Magnesium oxide | |
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| IUPAC name | Magnesium oxide |
| Other names | Magnesia Periclase |
| Properties | |
| Molecular formula | MgO |
| Molar mass | 40.304 g/mol |
| Appearance | White powder |
| Odor | Odorless |
| Density | 3.6 g/cm3 |
| Melting point | 2852 °C, 3125 K, 5166 °F |
| Boiling point | |
| Solubility | Soluble in acid, ammonia insoluble in alcohol |
| Band gap | 7.8 eV |
| −10.2·10−6 cm3/mol | |
| Thermal conductivity | 45–60 W·m−1·K−1 |
| Refractive index (nD) | 1.7355 |
| Dipole moment | 6.2 ± 0.6 D |
| Structure | |
| Crystal structure | Halite (cubic), cF8 |
| Space group | Fm3m, No. 225 |
| Lattice constant | a = 4.212Å |
| Coordination geometry | Octahedral (Mg2+); octahedral (O2−) |
| Thermochemistry | |
| Std enthalpy of formation ΔfH | −601.6 ± 0.3 kJ·mol−1 |
| Standard molar entropy S | 26.95 ± 0.15 J·mol−1·K−1 |
| Specific heat capacity, C | 37.2 J/mol K |
| Pharmacology | |
| ATC code | |
| Hazards | |
| Main hazards | Metal fume fever, Irritant |
| NFPA 704 |
0 1 0 |
| R-phrases | R36, R37, R38 |
| Flash point | Non-flammable |
| U.S. Permissible exposure limit (PEL) | TWA 15 mg/m3 (fume) |
| Related compounds | |
| Other anions | Magnesium sulfide |
| Other cations | Beryllium oxide Calcium oxide Strontium oxide Barium oxide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Magnesium oxide, or magnesia, is a white solid mineral, made of one part magnesium and one part oxygen. Its chemical formula is MgO. Magnesium oxide is used by libraries to make books last longer. It is also used as an insulator for some electrical wires, and to help crucibles resist high temperatures. Magnesium oxide is also used to treat heartburn and upset stomachs. view more...
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