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Silver sulfide
IUPAC name	Silver sulphide
Identifiers
CAS number	21548-73-2
Properties
Molecular formula	Ag2S
Molar mass	247.8 g/mol
Appearance	Black cubic crystal
Density	7.23 g/cm3
Melting point	1098 K (825 °C) (825 °C)
Solubility in water	8.5−15g in 1L water
Solubility	soluble in nitric acid, sulfuric acids
Structure
Crystal structure	orthogonal
Thermochemistry
Std enthalpy of; formation ΔfHo298	-32.6 kJ/mol
Standard molar; entropy So298	144.0 J/mol·K
Hazards
Main hazards	May cause irritation
	Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
	Infobox references

Silver sulfide (or Silver sulphide in British English), Ag₂S, is a black 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.

[edit] Structure

There are three forms, monoclinic acanthite, stable below 500°C, body centered cubic so-called argentite, stable above 176°C, and a high temperature face-centred cubic form stable above 586°C.^[1] The higher temperature forms are electrical conductors.^[1]

[edit] References

^ ^a ^b Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6

[edit] External links

Silver Sulfide

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[Wells-0] Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6

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