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Cadmium sulfide

Cadmium sulfide
Other names Cadmium(II) sulfide
CAS number 1306-23-6
EINECS number 215-147-8
RTECS number EV3150000
Molecular formula CdS
Molar mass 144.46 g/mol
Appearance Yellow-orange solid.
Density 4.82 g/cm3, solid.
Melting point

1750°C at 100 bar

Boiling point

980°C subl.

Solubility in water Insoluble
Crystal structure Hexagonal
EU classification Toxic
Carc. Cat. 2
Muta. Cat. 3
Repr. Cat. 3
Dangerous for
the environment
Flash point non flammable
Related Compounds
Other anions Cadmium oxide
Cadmium selenide
Other cations Zinc sulfide
Mercury sulfide
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Cadmium sulfide is a chemical compound with the formula CdS. It exists in nature as two different minerals, greenockite and hawleyite.

Greenockite forms hexagonal crystals with the wurtzite structure. It has a yellowish colour with specific gravity of 4.7 and Mohs hardness of 3.8. Hawleyite has the sphalerite (zinc blende) structure.

Synthetic cadmium pigments based on cadmium sulfide are valued for their good thermal stability in many polymers, for example in engineering plastics. By adding selenium in its formula its possible to obtain colors ranging from a greenish yellow to red violet pigment. The weather resistance for this pigment is 8 in full tone, which means that it is a good pigment for UV.

Cadmium sulfide is a direct bandgap semiconductor with a bandgap of 2.42 eV. It has useful properties for optoelectronics, being used in both photosensitive and photovoltaic devices. One simple use is as a photoresistor whose electrical resistance changes with incident light levels.

Mixed with zinc sulfide, cadmium sulfide acts as a phosphor with long afterglow.

Cadmium sulfide was used as a pigment in paints as far back as 1819, but in small quantities due to its scarcity. Most cadmium sulfide used in paints is manufactured in chemical laboratories.

Such a painter as Claude Monet used it extensively due to its appealing shade of yellow well suited to his paintings.


  • International Chemical Safety Card 0404
  • Cadmium(II) sulphide information at Webelements
    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cadmium_sulfide". A list of authors is available in Wikipedia.
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