Magnesium diboride

Magnesium diboride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.352
EC Number
  • 234-501-2
  • InChI=1S/2B.Mg N
    Key: PZKRHHZKOQZHIO-UHFFFAOYSA-N N
  • [B-]=[B-].[Mg+2]
  • [Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[B-]1=[B-][B-]2=[B-][B-]=[B-]3[B-]=[B-][B-]4=[B-][B-]=[B-]5[B-]=[B-][B-]6=[B-][B-]=[B-]1[B-]7=[B-]2[B-]3=[B-]4[B-]5=[B-]67.[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2]
Properties
MgB2
Molar mass 45.93 g/mol
Density 2.57 g/cm3
Melting point 830 °C (1,530 °F; 1,100 K) (decomposes)
Structure
Hexagonal, hP3
P6/mmm, No. 191
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 diboride is the inorganic compound of magnesium and boron with the formula MgB2. It is a dark gray, water-insoluble solid. The compound becomes superconducting at 39 K (−234 °C), which has attracted attention. In terms of its composition, MgB2 differs strikingly from most low-temperature superconductors, which feature mainly transition metals. Its superconducting mechanism is primarily described by BCS theory.

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