Magnesium diboride

Magnesium diboride
	Ball-and-stick model of the part of the crystal structure of magnesium diboride
Identifiers
CAS Number	12007-25-9 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	13118398 ;
ECHA InfoCard	100.031.352
EC Number	234-501-2;
PubChem CID	15987061;
CompTox Dashboard (EPA)	DTXSID60893677 ;
	InChI InChI=1S/2B.Mg Key: PZKRHHZKOQZHIO-UHFFFAOYSA-N ;
	SMILES [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
Chemical formula	MgB2
Molar mass	45.93 g/mol
Density	2.57 g/cm3
Melting point	830 °C (1,530 °F; 1,100 K) (decomposes)
Structure
Crystal structure	Hexagonal, hP3
Space group	P6/mmm, No. 191
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) 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 has attracted attention because it becomes superconducting at 39 K (−234 °C). 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.

Identifiers
Ball-and-stick model of the part of the crystal structure of magnesium diboride

CAS Number	12007-25-9^Y
3D model (JSmol)	Interactive image Interactive image
ChemSpider	13118398^N
ECHA InfoCard	100.031.352
EC Number	234-501-2
PubChem CID	15987061
CompTox Dashboard (EPA)	DTXSID60893677
InChI InChI=1S/2B.Mg^N Key: PZKRHHZKOQZHIO-UHFFFAOYSA-N^N
SMILES [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
Chemical formula	MgB₂
Molar mass	45.93 g/mol
Density	2.57 g/cm³
Melting point	830 °C (1,530 °F; 1,100 K) (decomposes)
Structure
Crystal structure	Hexagonal, hP3
Space group	P6/mmm, No. 191
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references

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Magnesium diboride

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