Copper (II) selenide

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Crystal structure
Crystal structure of α-copper (II) selenide
__ Cu 2+      __ Se 2−
General
Surname Copper (II) selenide
other names

Copper selenide (ambiguous)

Ratio formula CuSe
Brief description

black solid

External identifiers / databases
CAS number 1317-41-5
EC number 215-272-8
ECHA InfoCard 100,013,885
PubChem 73980
Wikidata Q4413572
properties
Molar mass 142.50 g mol −1
Physical state

firmly

density

6.0-6.6 g cm -3

Melting point

550 ° C (decomposition)

solubility

almost insoluble in water

safety instructions
GHS labeling of hazardous substances
06 - Toxic or very toxic 08 - Dangerous to health 09 - Dangerous for the environment

danger

H and P phrases H: 301-331-373-410
P: 260-261-301 + 310-304 + 340-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

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

Occurrence

Copper (II) selenide occurs naturally in the form of the mineral klockmannite .

Extraction and presentation

Copper (II) selenide can be obtained by peritectic decomposition of copper diselenide CuSe 2 ( Kruťait ).

properties

Copper (II) selenide is a black solid that is insoluble in water. It is soluble in hydrogen chloride with evolution of selenium and soluble in sulfuric acid with evolution of sulfur dioxide . It is oxidized to copper (II) selenite CuSeO 3 by nitric acid. Copper (II) selenide occurs in three modifications. The α-form present at room temperature has a hexagonal crystal structure of the klockmannite type with the space group P 6 3 / mmc (space group no. 194) and is isotypic to that of copper (II) sulfide , the β present from 51 ° C -Form has an orthorhombic crystal structure and the γ-form present from 157 ° C again has a hexagonal crystal structure with the space group P 6 3 / mmc (No. 194) . Template: room group / 194Template: room group / 194

use

Copper (II) selenide is used as a semiconductor and as a catalyst in Kjeldah digestion .

Individual evidence

  1. ↑ a b c d e f g h i data sheet Copper (II) selenide, 99.5% (metals basis) from AlfaAesar, accessed on April 11, 2014 ( PDF )(JavaScript required) .
  2. ↑ a b D. J. Chakrabarti, DE Laughlin: The Cu / Se (Copper-Selenium) system. In: Bulletin of Alloy Phase Diagrams. 2, 1981, pp. 305-315, doi : 10.1007 / BF02868284 .
  3. ^ Helmut Schrätze, Karl-Ludwig Weiner: Mineralogie: A textbook on a systematic basis - Helmut Schrätze, Karl-Ludwig Weiner . Walter de Gruyter, 1981, ISBN 3-11-083686-6 , p. 223 ( limited preview in Google Book search).