Aluminum selenide

Crystal structure
__ Al 3+      __ Se 2−
General
Surname	Aluminum selenide
other names	Aluminum (III) selenide
Ratio formula	Al 2 Se 3
Brief description	brownish odorless solid
External identifiers / databases
CAS number 1302-82-5 EC number 215-110-6 ECHA InfoCard 100.013.737 PubChem 164804 Wikidata Q2634282
properties
Molar mass	290.84 g mol −1
Physical state	firmly
density	3.437 g cm −3
Melting point	950 ° C
solubility	Decomposes to Al (OH) 3 and H 2 Se in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-330-373-410 P: 260-301 + 310-304 + 340-320-330-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Aluminum selenide is an inorganic chemical compound of aluminum from the group of selenides .

Extraction and presentation

Aluminum selenide can be obtained by reacting aluminum with selenium at 1000 ° C.

${\displaystyle \mathrm {2\ Al+3\ Se\longrightarrow Al_{2}Se_{3}} }$

properties

Aluminum selenide is a moisture-sensitive yellow to brownish solid that decomposes aluminum hydroxide and hydrogen selenide in water .

${\displaystyle \mathrm {Al_{2}Se_{3}+6\ H_{2}O\longrightarrow 2\ Al(OH)_{3}+3\ H_{2}Se} }$

The basic substance is white, but the commercial product is usually yellow or brownish. It has a monoclinic crystal structure with the space group Cc (space group no. 9) and the lattice parameters a = 1168 pm, b = 673 pm, c = 733 pm and α = 121.1 ° as well as four formula units per unit cell. The compound is a semiconductor .

use

Aluminum selenide is used as a raw material for the production of hydrogen selenide in semiconductor production.

Individual evidence

1. ↑ ^{a b c d e f} data sheet Aluminum selenide, 99% (metals basis) at AlfaAesar, accessed on August 7, 2013 ( PDF )(JavaScript required) .
2. ^ ^{A b} Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 172 ( limited preview in Google Book search).
3. ^ ^{A b} Dale L. Perry: Handbook of Inorganic Compounds, Second Edition . Taylor & Francis, 2011, ISBN 1-4398-1462-7 , pp. 12 ( limited preview in Google Book search).
4. ↑ ^{a b} G. R. Waitkins, R. Shutt, Irvin W. Kinney, James P. McReynolds: Aluminum selenide and hydrogen selenide . In: W. Conard Fernelius (Ed.): Inorganic Syntheses . Vol. 2. John Wiley & Sons, Inc., 2007, ISBN 978-0-470-13233-3 , pp. 183-186 , doi : 10.1002 / 9780470132333.ch55 .
5. ^ Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer, 1998, ISBN 3-642-58842-5 , pp. 302 ( limited preview in Google Book search).