- Magnesium sulfide
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"MgS" redirects here. For other uses, see MGS (disambiguation).
Magnesium sulfide Other namesIdentifiers CAS number 12032-36-9 Properties Molecular formula MgS Molar mass 56.38 g/mol Density 2.68 g/cm3 Melting point >2000 °C
Solubility in water decomposes Structure Crystal structure Halite (cubic), cF8 Space group Fm3m, No. 225 Coordination
geometryoctahedral Hazards EU Index Not listed Related compounds Other anions Magnesium oxide Other cations Calcium sulfide
Strontium sulfide
Barium sulfidesulfide (verify) (what is:
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)Infobox references Magnesium sulfide is an inorganic compound with the formula MgS. It is a white 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.
Contents
Preparation and general properties
MgS is formed by the reaction of sulfur or hydrogen sulfide with magnesium. It crystallizes in the rock salt structure, although the zinc blende structure might be anticipated.[1] The chemical properties of MgS resemble those of related ionic sulfides such as those of Na, Ba, Ca. It reacts with oxygen to form the corresponding sulfate, magnesium sulfate. MgS reacts with water to give hydrogen sulfide and magnesium hydroxide.[2]
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.[3]
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.[4]
Occurrence
Aside from being a component of some slags, MgS is a rare nonterrestial mineral niningerite detected in some meteorites. MgS is also found in the circumstellar envelopes of certain evolved carbon stars, i. e., those with C/O > 1.[5]
Safety
MgS evolves hydrogen sulfide upon contact with moisture.
References
- ^ Guntert, O. J.; Faessler, A. "Lattice constants of the alkaline earth sulfides MgS, CaS, SrS, and BaS" Zeitschrift für Kristallographie, Kristallgeometrie, Kristallphysik, Kristallchemie (1956), volume 107, pages 357-61.
- ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- ^ 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.
- ^ 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.
- ^ Goebel, J. H., and Moseley, S. H., "MgS Grain Component in Circumstellar Shells," Astrophysical Journal (Letters) 290, L35 (1985)
Magnesium compounds Categories:- Sulfides
- Magnesium compounds
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