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Copper Sulfide

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  • Copper sulfides describe a family of chemical compounds and minerals with the formula CuxSy.

  • Both minerals and synthetic materials comprise these compounds. Some copper sulfides are economically important ores.Synonyms are cupric sulfide, copper sulphide, cuprous sulphide and copper (II) Sulfide.

  • Form of crystalline solid available in blue-black or black colour compound having density 4800 kg m-3.

  • Prominent copper sulfide minerals include Cu2S (Chalcocite) and CuS (covellite). In the mining industry, the minerals bornite or chalcopyrite, which consist of mixed copper-iron sulfides, are often referred to as "copper sulfides".

  • In chemistry, a "binary copper sulfide" is any binary chemical compound of the elements copper and sulfur. Whatever their source, copper sulfides vary widely in composition with 0.5 = Cu/S = 2, including numerous non-stoichiometric compounds.

  • Copper sulfides can be classified into three groups:1.Monosulfides,2.Mixed monosulfide & disulfide 3.copper disulfide.

  • Mixed monosulfide and disulfide compounds of copper contain both monosulfide (S2-) as well as disulfide (S2)n- anions. Their crystal structures usually consist of alternating hexagonal layers of monosulfide and disulfide anions with Cu cations in trigonal and tetrahedral interstices.

  • The copper ore (commonly chalcopyrite, CuFeS2) is crushed and ground before it is concentrated to between 20 and 40% copper in a flotation process.

  • At very high pressures, a copper disulfide, CuS2, can be synthesized and its crystal structure is analogous to that of pyrite, with all sulfur atoms occurring as S-S units.

  • Considered as a ideal absorber materials being non-toxic, cheap, abundant and with good absorption characteristics.

  • Copper sulfides has a band gap of 1.2eV which is nearly ideal for solar photovoltaic applications.
     

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