Aluminium diboride

Aluminium diboride
Names

IUPAC name aluminium diboride
Other names aluminium boride aluminum diboride
Identifiers
CAS Number	12041-50-8^Y
3D model (JSmol)	Interactive image
ChemSpider	21171253^Y
ECHA InfoCard	100.031.736
EC Number	234-923-7
PubChem CID	24884166
InChI InChI=1S/Al.B2/c;1-2/q-2;+2^Y Key: XGNZNBRDPPLKTC-UHFFFAOYSA-N^Y 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 (Δ_fH^o₂₉₈)	-151 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y (what is ^YN ?)
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.

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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