- Silver sulfide
chembox new
ImageFile =
ImageSize =
IUPACName =
SystematicName =
OtherNames =
Section1 = Chembox Identifiers
Abbreviations =
CASNo = 21548-73-2
EINECS =
EINECSCASNO =
PubChem =
SMILES =
InChI =
RTECS =
MeSHName =
ChEBI =
KEGG =
ATCCode_prefix =
ATCCode_suffix =
ATC_Supplemental =
Section2 = Chembox Properties
Formula = Ag2S
MolarMass = 247.8 g/mol
Appearance = Black cubic crystal
Density =
MeltingPt = 1098 K (825 °C)
Melting_notes =
BoilingPt =
Boiling_notes =
Solubility = 8.5− 15g in 1L water
SolubleOther =
Solvent =
LogP =
VaporPressure =
HenryConstant =
AtmosphericOHRateConstant =
pKa =
pKb =
Section3 = Chembox Structure
CrystalStruct =
Coordination =
MolShape =
Section4 = Chembox Thermochemistry
DeltaHf = -32.6 kJ/mol
DeltaHc =
Entropy = 144.0 J/mol·K
HeatCapacity =
Section5 = Chembox Pharmacology
AdminRoutes =
Bioavail =
Metabolism =
HalfLife =
ProteinBound =
Excretion =
Legal_status =
Legal_US =
Legal_UK =
Legal_AU =
Legal_CA =
PregCat =
PregCat_AU =
PregCat_US =
Section6 = Chembox Explosive
ShockSens =
FrictionSens =
ExplosiveV =
REFactor =
Section7 = Chembox Hazards
EUClass =
EUIndex =
MainHazards = May cause irritation
NFPA-H =
NFPA-F =
NFPA-R =
NFPA-O =
RPhrases =
SPhrases =
RSPhrases =
FlashPt =
Autoignition =
ExploLimits =
LD50 =
PEL =
Section8 = Chembox Related
OtherAnions =
OtherCations =
OtherFunctn =
Function =
OtherCpds =Silver sulfide (or "Silver sulphide" in British English), Ag2S, is the
sulfide ofsilver . It is black and constitutes thetarnish that forms on silver when exposed to thehydrogen sulfide of the atmosphere. It is found in nature as relatively low temperature mineralacanthite . The nameargentite refers to a cubic form, which, due to instability in "normal" temperatures, is found in form of the pseudomorphosis of acanthite afterargentite . When formed on electrical contacts operating in an atmosphere rich in hydrogen sulfide, long filaments known asSilver 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-calledargentite , 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]
Wikimedia Foundation. 2010.