Magnesium sulfide

Source: Wikipedia, the free encyclopedia.
"MgS" redirects here. For other uses, see MGS (disambiguation).
Not to be confused with Magnesium sulfate.
Magnesium sulfide
Magnesium sulfide crystal structure
Magnesium sulfide crystal structure
Names
Other names
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.031.597 Edit this at Wikidata
EC Number
  • 234-771-1
UNII
  • InChI=1S/Mg.S/q+2;-2 ☒N
    Key: QENHCSSJTJWZAL-UHFFFAOYSA-N ☒N
  • InChI=1/Mg.S/q+2;-2
    Key: QENHCSSJTJWZAL-UHFFFAOYAO
SMILES
  • [Mg+2].[S-2]
Properties
MgS
Molar mass 56.38 g/mol
Appearance white to reddish brown powder
Density 2.84 g/cm3
Melting point 2,000 °C (3,630 °F; 2,270 K) approx.
decomposes
Structure
Halite (cubic), cF8
Fm3m, No. 225
cubic
Thermochemistry
45.6 J/mol K
50.3 J/mol K
Std enthalpy of
formation
(ΔfH⦵298)
 −347 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Source of H2S
Related compounds
Other anions
 Magnesium oxide
Other cations
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 sulfide is an

crystalline
material but often is encountered in an impure form that is brown and non-crystalline powder. It is generated industrially in the production of metallic iron.

Preparation and general properties

MgS is formed by the reaction of

molecular beam epitaxy. The chemical properties of MgS resemble those of related ionic sulfides such as those of sodium, barium, or calcium. It reacts with oxygen to form the corresponding sulfate, magnesium sulfate. MgS reacts with water to give hydrogen sulfide and magnesium hydroxide.[3]

Applications

In the BOS steelmaking process, sulfur is the first element to be removed. Sulfur is removed from the impure blast furnace iron by the addition of several hundred kilograms of magnesium powder by a lance. Magnesium sulfide is formed, which then floats on the molten iron and is removed.[4]

MgS is a wide band-gap direct semiconductor of interest as a blue-green emitter, a property that has been known since the early 1900s.[5] The wide-band gap property also allows the use of MgS as photo-detector for short wavelength ultraviolet light.[6]

Occurrence

Aside from being a component of some slags, MgS is a rare nonterrestrial mineral niningerite detected in some meteorites. It is also a solid solution component along with CaS and FeS in oldhamite. MgS is also found in the circumstellar envelopes of certain evolved carbon stars, i. e., those with C/O > 1.[7]

Safety

MgS evolves hydrogen sulfide upon contact with moisture.

References

  1. doi:10.1063/1.126824
    .
  2. doi:10.1063/1.4803000
    .
  3. ISBN 0-12-352651-5
    .
  4. ^ Irons, G. A.; Guthrie, R. I. L. "Kinetic aspects of magnesium desulfurization of blast furnace iron" Ironmaking and Steelmaking (1981), volume 8, pp.114-21.
  5. ^ Tiede, E. "Reindarstellung von Magnesiumsulfid und seine Phosphorescenz. I (Preparation of pure magnesium sulfide and its phosphorescence. I)" Berichte der Deutschen Chemischen Gesellschaft (1916), volume 49, pages 1745-9.
  6. doi:10.1063/1.3690124
    .
  7. doi:10.1086/184437
    .
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