Aluminium diboride

Aluminium diboride

Names
IUPAC name aluminium diboride
Other names aluminium boride aluminum diboride
Identifiers
CAS Number	12041-50-8
ChemSpider	21171253
EC Number	234-923-7
Jmol interactive 3D	Image
InChI InChI=1S/Al.B2/c;1-2/q-2;+2 Key: XGNZNBRDPPLKTC-UHFFFAOYSA-N InChI=1/Al.B2/c;1-2/q-2;+2/rAlB2/c1-2-3-1 Key: XGNZNBRDPPLKTC-DOGMWQOPAK
SMILES B1=B[Al]1
Properties
Chemical formula	AlB2
Molar mass	48.604 g/mol
Appearance	Copper-red solid
Density	3.19 g/cm³
Melting point	1,655 °C (3,011 °F; 1,928 K)
Solubility in water	insoluble
Structure
Crystal structure	Hexagonal, hP3
Space group	P6/mmm, No. 191
Thermochemistry
Specific heat capacity (C)	43.6 J/mol K
Std molar entropy (S^o298)	34.7 J/mol K
Std enthalpy of formation (ΔfH^o298)	-151 kJ/mol
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

Aluminium diboride (AlB₂) is a chemical compound made from the metal aluminium and the metalloid boron. It is one of two compounds of aluminium and boron, the other being AlB₁₂, which are both commonly referred to as aluminium boride.

Structurally the B atoms form graphite-like sheets with Al atoms between them, and this is very similar to the structure of magnesium diboride. Single crystals of AlB₂ exhibit metallic conductivity along the axis parallel to the basal hexagonal plane.^[1]

Aluminium boride is considered a hazardous substance as it reacts with acids and hydrogen gas to produce toxic gases. For example, it reacts with hydrochloric acid to release borane and aluminium chloride.

See also

• Boride

References

1. "On the electronic and structural properties of aluminum diboride Al_0.9B₂" Burkhardt, Ulrich; Gurin, Vladimir; Haarmann, Frank; Borrmann, Horst; Schnelle, Walter; Yaresko, Alexander; Grin, Yuri Journal of Solid State Chemistry 177 (2004) 389-394

External links

• "Boron";