Magnesium oxide

Magnesium oxide
Names
IUPAC name
Magnesium oxide
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]
1.7355
6.2 ± 0.6 D
Structure
Halite (cubic), cF8
Fm3m, No. 225
a = 4.212Å



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
A02AA02 (WHO) A06AD02 (WHO), A12CC10 (WHO)
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
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Other cations {{{value}}}
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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

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 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.
  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 2014-03-31.
  3. ↑ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.133. ISBN 1439855110.
  4. ↑ Application of magnesium compounds to insulating heat-conductive fillers Archived 2013-12-30 at the Wayback Machine. konoshima.co.jp
  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.