Aluminium diboride
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.
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| Names | |
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| IUPAC name
aluminium diboride | |
| Other names
aluminium boride aluminum diboride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.736 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| 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° | |
Formula units (Z) |
1 |
| Thermochemistry | |
Heat capacity (C) |
43.6 J/mol K |
Std molar entropy (S |
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). | |
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| Infobox references | |
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.
See also
References
- Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.45. ISBN 1439855110.
- Felten, Edward J (1956). "The Preparation of Aluminum Diboride, AlB21". Journal of the American Chemical Society. 78 (23): 5977. doi:10.1021/ja01604a003.
- Burkhardt, U; Gurin, Vladimir; Haarmann, Frank; Borrmann, Horst; Schnelle, Walter; Yaresko, Alexander; Grin, Yuri (2004). "On the electronic and structural properties of aluminum diboride Al0.9B2". Journal of Solid State Chemistry. 177 (2): 389. Bibcode:2004JSSCh.177..389B. doi:10.1016/j.jssc.2002.12.001.
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