Magnesium oxide
chemical compound naturally occurring as periclase
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.
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| Names | ||
|---|---|---|
| IUPAC name
Magnesium oxide
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| Other names
Magnesia
Periclase | ||
| Properties | ||
| MgO | ||
| Molar mass | 40.304 g/mol[1] | |
| Appearance | White powder | |
| Odor | Odorless | |
| Density | 3.6 g/cm3[1] | |
| Melting point | 2,852 °C (5,166 °F; 3,125 K)[1] | |
| Boiling point | 3,600 °C (6,510 °F; 3,870 K)[1] | |
| Solubility | Soluble in acid, ammonia insoluble in alcohol | |
| Band gap | 7.8 eV[2] | |
| −10.2·10−6 cm3/mol[3] | ||
| Thermal conductivity | 45–60 W·m−1·K−1[4] | |
Refractive index (nD)
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1.7355 | |
| 6.2 ± 0.6 D | ||
| Structure | ||
| Halite (cubic), cF8 | ||
| Fm3m, No. 225 | ||
a = 4.212Å
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| Octahedral (Mg2+); octahedral (O2−) | ||
| Thermochemistry | ||
| Std enthalpy of formation ΔfH |
−601.6 ± 0.3 kJ·mol−1[5] | |
| Standard molar entropy S |
26.95 ± 0.15 J·mol−1·K−1[5] | |
| Specific heat capacity, C | 37.2 J/mol K[6] | |
| Pharmacology | ||
| A02AA02 (WHO) A06AD02 (WHO), A12CC10 (WHO) | ||
| Hazards | ||
| Main hazards | Metal fume fever, Irritant | |
| NFPA 704 |
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| R-phrases | R36, R37, R38 | |
| Flash point | Non-flammable | |
| U.S. Permissible exposure limit (PEL) |
TWA 15 mg/m3 (fume) | |
| Related compounds | ||
| Other anions | {{{value}}} | |
| Other cations | {{{value}}} | |
| Related compounds | {{{value}}} | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | ||
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| Infobox references | ||
References
change- ↑ 1.0 1.1 1.2 1.3 Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.74. ISBN 1439855110.
- ↑ Taurian, O.E.; Springborg, M.; Christensen, N.E. (1985). "Self-consistent electronic structures of MgO and SrO" (PDF). Solid State Communications. 55 (4): 351–5. Bibcode:1985SSCom..55..351T. doi:10.1016/0038-1098(85)90622-2. Archived from the original (PDF) on 2016-03-03. Retrieved 2014-03-31.
- ↑ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.133. ISBN 1439855110.
- ↑ Application of magnesium compounds to insulating heat-conductive fillers Archived 2013-12-30 at the Wayback Machine. konoshima.co.jp
- ↑ 5.0 5.1 Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 5.2. ISBN 1439855110.
- ↑ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 5.15. ISBN 1439855110.