Aluminium diboride

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Aluminium diboride
Names
IUPAC name
aluminium diboride
Other names
aluminium boride
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.031.736 Edit this at Wikidata
EC Number
  • 234-923-7
  • InChI=1S/Al.B2/c;1-2/q-2;+2 checkY
    Key: XGNZNBRDPPLKTC-UHFFFAOYSA-N checkY
  • InChI=1/Al.B2/c;1-2/q-2;+2/rAlB2/c1-2-3-1
    Key: XGNZNBRDPPLKTC-DOGMWQOPAK
  • B1=B[Al]1
Properties
AlB2
Molar mass 48.604 g/mol[1]
Appearance Copper-red solid
Density 3.19 g/cm3[1]
Melting point >920 °C (decomposes)[1]
insoluble
Structure[2]
Hexagonal, hP3
P6/mmm, No. 191
a = 0.3009 nm, b = 0.3009 nm, c = 0.3262 nm,
α = 90°, β = 90°, γ = 120°
1
Thermochemistry
43.6 J/mol K
34.7 J/mol K
Std enthalpy of
formation
(ΔfH⦵298)
 -151 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

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.[3]

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.

The crystal structure of AlB2 is often used as a prototype structure to describe

structure types that fall within the AlB2 structural family.[4]

See also

References

  1. ^
    ISBN 1-4398-5511-0
    .
  2. doi:10.1021/ja01604a003
    .
  3. doi:10.1016/j.jssc.2002.12.001
    .
  4. S2CID 98251655
    .

External links


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