Copper (I) selenide

General
Surname	Copper (I) selenide
other names	Dicopper selenide
Molecular formula	Cu 2 Se
Brief description	bluish black solid
External identifiers / databases
CAS number 20405-64-5 EC number 243-796-7 ECHA InfoCard 100,039,799 PubChem 6914519 Wikidata Q4413571
properties
Molar mass	206.05 g mol −1
Physical state	firmly
density	6.84 g cm −3 (25 ° C)
Melting point	1113 ° C
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 301-331-373-410 P: 261-273-301 + 310-311-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Copper (I) selenide is an inorganic chemical compound of copper from the group of selenides .

Occurrence

Copper (I) selenide occurs naturally in the form of the minerals bellidoite and berzelianite .

Extraction and presentation

Copper (I) selenide can be obtained by reacting copper with selenium at 300 ° C to 400 ° C.

${\displaystyle \mathrm {2\ Cu+Se\longrightarrow Cu_{2}Se} }$

properties

Copper (I) selenide is a bluish-black solid. It exists in two modifications: below 131 ° C as β-Cu ₂ Se with a tetragonal , pseudocubic crystal structure (a = 1163 pm, c = 1140 pm) and above as α-Cu ₂ Se with a cubic crystal structure.

Individual evidence

1. ↑ ^{a b c d} 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. 983.
2. ↑ ^{a b c d} data sheet Copper (I) selenide, 99.95% trace metals basis from Sigma-Aldrich , accessed on April 11, 2014 ( PDF ).