Magnesium oxide

Magnesium oxide
Names
IUPAC name
Magnesium oxide
Other names
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.013.793 Edit this at Wikidata
EC Number
  • 215-171-9
E number E530 (acidity regulators, ...)
KEGG
RTECS number
  • OM3850000
UNII
  • InChI=1S/Mg.O
    Key: CPLXHLVBOLITMK-UHFFFAOYSA-N
  • O=[Mg]
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]
1.7355
6.2 ± 0.6 D
Structure
Halite (cubic), cF8
Fm3m, No. 225
a = 4.212Å
Octahedral (Mg2+); octahedral (O2−)
Thermochemistry
37.2 J/mol K[8]
26.95 ± 0.15 J·mol−1·K−1[9]
−601.6 ± 0.3 kJ·mol−1[9]
-569.3 kJ/mol[8]
Pharmacology
A02AA02 (WHO) A06AD02 (WHO), A12CC10 (WHO)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Metal fume fever, Irritant
GHS labelling:
GHS07: Exclamation mark
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)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Flash point Non-flammable
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 15 mg/m3 (fume)[10]
REL (Recommended)
 None designated[10]
IDLH (Immediate danger)
 750 mg/m3 (fume)[10]
Safety data sheet (SDS) ICSC 0504
Related compounds
Other anions
 Magnesium sulfide
Magnesium selenide
Other cations
 Beryllium oxide
Calcium oxide
Strontium oxide
Barium oxide
Related compounds
 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.

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ Application of magnesium compounds to insulating heat-conductive fillers Archived 2013-12-30 at the Wayback Machine. konoshima.co.jp
  5. ^ Cite error: The named reference Johnson-1986 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Subramanian-1989 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Hornak-2018 was invoked but never defined (see the help page).
  8. ^ 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.
  9. ^ 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.
  10. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0374". National Institute for Occupational Safety and Health (NIOSH).


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