Silver sulfide

Silver sulfide

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CASNo = 21548-73-2
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Formula = Ag2S
MolarMass = 247.8 g/mol
Appearance = Black cubic crystal
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MeltingPt = 1098 K (825 °C)
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Silver sulfide (or "Silver sulphide" in British English), Ag2S, is the sulfide of silver. It is black and constitutes the tarnish that forms on silver when exposed to the hydrogen sulfide of the atmosphere. It is found in nature as relatively low temperature mineral acanthite. The name argentite refers to a cubic form, which, due to instability in "normal" temperatures, is found in form of the pseudomorphosis of acanthite after argentite. When formed on electrical contacts operating in an atmosphere rich in hydrogen sulfide, long filaments known as Silver Whiskers can form. Acanthite is an important ore of silver.

tructure

There are three forms , monoclinic acanthite, stable below 176°C, body centered cubic so-called argentite, stable above 176°C, and a high temperature face centred cubic form stable above 586°C. Wells A.F. (1984) "Structural Inorganic Chemistry" 5th edition Oxford Science Publications ISBN 0-19-855370-6 ] In the monoclinic form there are two crystallographically distinct silver atoms with two and three near neighbour sulfur atoms. The higher temperature forms are electrical conductors.

References

External links

* [http://www.saltlakemetals.com/Silver_Sulfide.htm Silver Sulfide]


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