Copper(I) sulfide

Chalcocite ( mineral )

Odorless, blue -gray to black, lustrous powder

Fixed

5.6 g · cm -3

1100 ° C.

Insoluble in water

0.1 mg · m-3

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Copper ( I) sulphide is a chemical compound of copper and sulfur.

Occurrence

Copper (I ) sulfide occurs naturally as the mineral chalcocite (also called chalcocite ) ago.

Production and representation

Copper (I ) sulfide may be recovered at an elevated temperature in vacuum from the elements copper and sulfur.

Properties

Copper (I ) sulfide is a blue to blue- gray solid that is practically insoluble in water. It is very slightly soluble in hydrochloric acid and exists in two modifications. Has the present, at temperatures up to 110 ° C β - form of an orthorhombic crystal structure with space group Ab2m (a = 11.88, b = 27.32, c = 13.49 Å). Above it is the α - form of a hexagonal crystal structure, and the space group P63/mmc. The latter occurs only with copper deficiency, wherein the composition is about Cul, 58S. The enthalpy of formation of copper ( I) sulphide is -79.5 kJ / mol.

Use

Copper (I ) sulfide is used as a colorant for paint ( black color together with copper (I ) oxide ) and used for the preparation of the nanocrystal layers.