Silver tungstate

Silver tungstate is an inorganic tungstate with the chemical formula Ag₂WO₄. It has been applied in various fields such as photoluminescence, antibacterial action, ozone gas sensors and humidity sensors.^[2][3] It is also used in the electronic and chemical industries, and also used in proteomics research.^[4]

Silver tungstate

Names
IUPAC name Disilver;dioxido(dioxo)tungsten
Identifiers
CAS Number	13465-93-5 Y
3D model (JSmol)	Interactive image
ChemSpider	10790108
ECHA InfoCard	100.033.357
EC Number	236-708-3
PubChem CID	22045798
InChI InChI=1S/2Ag.4O.W/q2*+1;;;2*-1; Key: QEKREONBSFPWTQ-UHFFFAOYSA-N
SMILES [O-][W](=O)(=O)[O-].[Ag+].[Ag+]
Properties
Chemical formula	Ag2WO4
Molar mass	463.57 g mol−1
Hazards
GHS labelling:[1]
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Phases

Silver tungstate occurs in three polymorphic phases: orthorhombic (α), hexagonal (β) and cubic (γ).^[2] α-silver tungstate is thermodynamically stable, while β- and γ-silver tungstate are metastable.^[5]

Synthesis

Silver tungstate is synthesised through the following reaction between silver nitrate and sodium tungstate, producing sodium nitrate as a byproduct:^[2]

2 AgNO₃ + Na₂WO₄ → Ag₂WO₄ + 2 NaNO₃