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Aluminium diboride

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Aluminium diboride
Names
IUPAC name aluminium diboride
Other names aluminium boride
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.736 Edit this at Wikidata
EC Number
  • 234-923-7
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Al.B2/c;1-2/q-2;+2Key: XGNZNBRDPPLKTC-UHFFFAOYSA-N
  • InChI=1/Al.B2/c;1-2/q-2;+2/rAlB2/c1-2-3-1Key: XGNZNBRDPPLKTC-DOGMWQOPAK
SMILES
  • B1=B1
Properties
Chemical formula AlB2
Molar mass 48.604 g/mol
Appearance Copper-red solid
Density 3.19 g/cm
Melting point >920 °C (decomposes)
Solubility in water insoluble
Structure
Crystal structure Hexagonal, hP3
Space group P6/mmm, No. 191
Lattice constant a = 0.3009 nm, b = 0.3009 nm, c = 0.3262 nm,α = 90°, β = 90°, γ = 120°
Formula units (Z) 1
Thermochemistry
Heat capacity (C) 43.6 J/mol K
Std molar
entropy (S298) 		34.7 J/mol K
Std enthalpy of
formation (ΔfH298) 		-151 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

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.

The crystal structure of AlB2 is often used as a prototype structure to describe intermetallic compounds. There are a large number of structure types that fall within the AlB2 structural family.

See also

References

  1. ^ Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, Florida: CRC Press. p. 4.45. ISBN 1-4398-5511-0.
  2. Felten, Edward J (1956). "The Preparation of Aluminium Diboride, AlB21". Journal of the American Chemical Society. 78 (23): 5977–5978. doi:10.1021/ja01604a003.
  3. Burkhardt, U; Gurin, Vladimir; Haarmann, Frank; Borrmann, Horst; Schnelle, Walter; Yaresko, Alexander; Grin, Yuri (2004). "On the electronic and structural properties of aluminium diboride Al0.9B2". Journal of Solid State Chemistry. 177 (2): 389. Bibcode:2004JSSCh.177..389B. doi:10.1016/j.jssc.2002.12.001.
  4. Hoffmann, R.-D.; Pöttgen, Rainer (2001-01-01). "AlB2-related intermetallic compounds – a comprehensive view based on group-subgroup relations". Zeitschrift für Kristallographie - Crystalline Materials. 216 (3). Walter de Gruyter GmbH: 127–145. Bibcode:2001ZK....216..127H. doi:10.1524/zkri.216.3.127.20327. ISSN 2196-7105. S2CID 98251655.

External links

Aluminium compounds
Al(I)
Organoaluminium(I) compoundsAl(C5(CH3)5)
Al(II)
Al(III)
Alums
Organoaluminium(III) compounds
Borides Bx
BxHy He
Li Be B C N O F Ne
Na MgB2 AlB2
AlB12 		SiBx P S Cl Ar
K CaB4
CaB6 		ScB12 TiB2 V CrB Mn FeB4
FexBy 		CoxBy Ni3B
Ni2B 		Cu Zn Ga Ge As Se Br Kr
Rb SrB6 YBx ZrB2 NbB2 Mo Tc RuBx Rh Pd Ag Cd In Sn Sb Te I Xe
Cs BaB6 * LuB4
LuB6 		HfB2 TaBx WxBy ReB2 OsBx Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
 
* LaB4
LaB6 		CeB4
CeB6 		PrB4
PrB6 		NdB4
NdB6 		Pm SmB4
SmB6 		EuB6 GdB4
GdB6 		TbB4
TbB6 		DyB4
DyB6 		HoB4
HoB6 		ErB4
ErB6 		TmB4
TmB6 		YbB4
YbB6
** Ac Th Pa UB2 Np PuBx Am Cm Bk Cf Es Fm Md No


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