Aluminium diboride

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Aluminium diboride
CAS number 12041-50-8 YesY
ChemSpider 21171253 YesY
EC number 234-923-7
Jmol-3D images Image 1
Molecular 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
Crystal structure Hexagonal, hP3
Space group P6/mmm, No. 191
heat capacity
43.6 J/mol K
Std molar
34.7 J/mol K
Std enthalpy of
-151 kJ/mol
Except where noted otherwise, 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.

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External links[edit]


  1. ^ "On the electronic and structural properties of aluminum diboride Al0.9B2" Burkhardt, Ulrich; Gurin, Vladimir; Haarmann, Frank; Borrmann, Horst; Schnelle, Walter; Yaresko, Alexander; Grin, Yuri Journal of Solid State Chemistry 177 (2004) 389-394