Aluminum diboride

Crystal structure
__ Al      __ B
Space group	P 6 / mmm (No. 191)
General
Surname	Aluminum diboride
other names	Aluminum boride (ambiguous)
Ratio formula	AlB 2
Brief description	black solid
External identifiers / databases
CAS number 12041-50-8 EC number 234-923-7 ECHA InfoCard 100,031,736 PubChem 24884166 ChemSpider 21171253 Wikidata Q4115930
properties
Molar mass	48.60 g mol −1
Physical state	firmly
density	3.172 g cm −3
Melting point	975 ° C (decomposition)
solubility	reacts slowly with water
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Aluminum diboride is an inorganic chemical compound of aluminum from the group of borides .

Extraction and presentation

Aluminum diboride can be obtained by reacting aluminum with boron in a vacuum at 800 ° C.

${\displaystyle \mathrm {Al+2\ B\longrightarrow AlB_{2}} }$

properties

Aluminum diboride is a dark solid that can also be in the form of shiny hexagonal plates. Its reaction behavior is very dependent on the particle size. At temperatures above 975 ° C it breaks down into aluminum and aluminum dodecaboride AlB ₁₂ . It has a hexagonal crystal structure (a = 300.9 pm, c = 326.2 pm) with the space group P 6 / mmm (space group no. 191) and forms mixed crystals with the magnesium diboride and manganese diboride crystallizing in the same lattice .

See also

• Aluminum dodecaboride (AlB ₁₂ )

Individual evidence

1. ^ ^{A b c d e} Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 292 ( limited preview in Google Book search).
2. ↑ ^{a b} Data sheet Aluminum diboride, −325 mesh from Sigma-Aldrich , accessed on January 27, 2014 ( PDF ).
3. ↑ ^{a b c} Georg Brauer (ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 788.
4. ^ HJ Becher: On the representation and stability of aluminum diboride. In: Journal of Inorganic and General Chemistry. 308, 1961, pp. 13-22, doi : 10.1002 / zaac.19613080104 .