Back Magnesiumoksied Afrikaans أكسيد المغنيسيوم Arabic اوکسید منیزیوم AZB Аксід магнію Byelorussian Магнезиев оксид Bulgarian ম্যাগনেসিয়াম অক্সাইড Bengali/Bangla Òxid de magnesi Catalan Oxid hořečnatý Czech Çунтарнă магнези CV Magnesiwm ocsid Welsh
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| Names | |
|---|---|
| IUPAC name
Magnesium oxide
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Other names
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| Identifiers | |
3D model (JSmol)
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| ChEMBL | |
| ChemSpider | |
| ECHA InfoCard | 100.013.793 |
| EC Number |
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| E number | E530 (acidity regulators, ...) |
| KEGG | |
PubChem CID
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA)
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| 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 |
| Electrical resistivity | Dielectric[a] |
| 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 | |
Heat capacity (C)
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37.2 J/mol K[8] |
Std molar
entropy (S⦵298) |
26.95 ± 0.15 J·mol−1·K−1[9] |
Std enthalpy of
formation (ΔfH⦵298) |
−601.6 ± 0.3 kJ·mol−1[9] |
Gibbs free energy (ΔfG⦵)
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-569.3 kJ/mol[8] |
| Pharmacology | |
| A02AA02 (WHO) A06AD02 (WHO), A12CC10 (WHO) | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
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Metal fume fever, Irritant |
| GHS labelling: | |
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| Warning | |
| H315, H319, H335 | |
| P261, P264, P271, P273, P280, P302+P352, P304+P340, P305+P351+P338, P312, P333+P313, P337+P313, P362, P363, P391, P403+P233, P405 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 15 mg/m3 (fume)[10] |
REL (Recommended)
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None designated[10] |
IDLH (Immediate danger)
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750 mg/m3 (fume)[10] |
| Safety data sheet (SDS) | ICSC 0504 |
| Related compounds | |
Other anions
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Magnesium sulfide Magnesium selenide |
Other cations
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Beryllium oxide Calcium oxide Strontium oxide Barium oxide |
Related compounds
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Magnesium hydroxide Magnesium nitride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + H2O → Mg(OH)2), but it can be reversed by heating it to remove moisture.
Magnesium oxide was historically known as magnesia alba (literally, the white mineral from Magnesia), to differentiate it from magnesia nigra, a black mineral containing what is now known as manganese.
- ^ a b c d Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.74. ISBN 1-4398-5511-0.
- ^ 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 2012-03-27.
- ^ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.133. ISBN 1-4398-5511-0.
- ^ Application of magnesium compounds to insulating heat-conductive fillers Archived 2013-12-30 at the Wayback Machine. konoshima.co.jp
- ^ Cite error: The named reference
Johnson-1986was invoked but never defined (see the help page). - ^ Cite error: The named reference
Subramanian-1989was invoked but never defined (see the help page). - ^ Cite error: The named reference
Hornak-2018was invoked but never defined (see the help page). - ^ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 5.15. ISBN 1-4398-5511-0.
- ^ a b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 5.2. ISBN 1-4398-5511-0.
- ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0374". National Institute for Occupational Safety and Health (NIOSH).
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