Magnesium sulfide

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Magnesium sulfide
Magnesium sulfide crystal structure
Identifiers
CAS number 12032-36-9 YesY
PubChem 82824
ChemSpider 8305407 N
Jmol-3D images Image 1
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
geometry
octahedral
Hazards
EU Index Not listed
Related compounds
Other anions Magnesium oxide
Other cations Calcium sulfide
Strontium sulfide
Barium sulfide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
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.

Preparation and general properties[edit]

MgS is formed by the reaction of sulfur or hydrogen sulfide with magnesium. It crystallizes in the rock salt structure as its most stable phase, its zinc blende [1] and wurtzite [2] structures can be prepared by Molecular Beam Epitaxy. 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.[3]

Applications[edit]

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[edit]

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.[7]

Safety[edit]

MgS evolves hydrogen sulfide upon contact with moisture.

References[edit]

  1. ^ C. Bradford, C. B. O'Donnell, B. Urbaszek, A. Balocchi, C. Morhain, K. A. Prior, and B. C. Cavenett, Appl. Phys. Lett. 76, 3929 (2000).
  2. ^ Y. H. Lai, Q. L. He, W. Y. Cheung, S. K. Lok, K. S. Wong, S. K. Ho, K. W. Tam, and I. K. Sou, "Molecular beam epitaxy-grown wurtzite MgS thin films for solar-blind ultra-violet detection", Applied Physics Letters 102, 171104 (2013). http://dx.doi.org/10.1063/1.4803000
  3. ^ Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. 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. ^ Ying Hoi Lai, Wai-Yip Cheung, Shu-Kin Lok, George K.L. Wong, Sut-Kam Ho, Kam-Weng Tam and Iam-Keong Sou, "Rocksalt MgS solar blind ultra-violet detectors", AIP Advances, 2, 012149 (2012).http://dx.doi.org/10.1063/1.3690124
  7. ^ Goebel, J. H., and Moseley, S. H., "MgS Grain Component in Circumstellar Shells," Astrophysical Journal (Letters) 290, L35 (1985)