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Magnesium oxide




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Magnesium oxide
Magnesium oxide.jpg
NaCl polyhedra.png
IUPAC name Magnesium oxide
Other names Magnesia
Periclase
Identifiers
CAS number 1309-48-4
PubChem 14792
EC number 215-171-9
RTECS number OM3850000
Properties
Molecular formula MgO
Molar mass 40.304 g/mol[1]
Appearance White powder
Odor Odorless
Density 3.6 g/cm3[1]
Melting point

2852 °C, 3125 K, 5166 °F

Boiling point

3600 °C, 3873 K, 6512 °F

Solubility Soluble in acid, ammonia
insoluble in alcohol
Band gap 7.8 eV[2]
−10.2·10−6 cm3/mol[4]
Thermal conductivity 45–60 W·m−1·K−1[3]
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
ΔfHo298
−601.6 ± 0.3 kJ·mol−1[5]
Standard molar
entropy
So298
26.95 ± 0.15 J·mol−1·K−1[5]
Specific heat capacity, C 37.2 J/mol K[6]
Pharmacology
ATC code
Hazards
Main hazards Metal fume fever, Irritant
NFPA 704

NFPA 704.svg

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.

References

  1. 1.0 1.1 Cite error: Invalid <ref> tag; no text was provided for refs named b92.
  2. Taurian, O.E.; Springborg, M.; Christensen, N.E. (1985). "Self-consistent electronic structures of MgO and SrO". Solid State Communications 55 (4): 351–5. doi:10.1016/0038-1098(85)90622-2 . http://users-phys.au.dk/nec/Papers/necSSC/SSC55351.pdf. 
  3. Application of magnesium compounds to insulating heat-conductive fillers Archived 2013-12-30 at the Wayback Machine. konoshima.co.jp
  4. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.133. ISBN 1439855110 . 
  5. 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 . 
  6. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 5.15. ISBN 1439855110 . 



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