Silver(I,III) oxide

Silver(I,III) oxide
	Ag(I) Ag(III) O
Names
	IUPAC name silver(I,III) Oxide
	Other names tetrasilver tetroxide, silver peroxide, argentic oxide, silver suboxide, divasil
Identifiers
CAS Number	1301-96-8 ; 155645-89-9 https://pubchem.ncbi.nlm.nih.gov/compound/44150047 lists only CAS 155645-89-9. Perhaps the CASNo 1301-96-8 is due to https://patents.justia.com/patent/6645531 (Antelman, year 2000): "Tetrasilver tetroxide compositions... have been commercially sold under the poorly named “Ag(II) OXIDE” tradename. They may be obtained from Aldrich Chemical Co., Inc...";
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.013.726
EC Number	215-098-2;
PubChem CID	44150047;
UNII	4C3LTJ9O6J ;
	InChI InChI=1S/4Ag.4O Key: RARXNJBGGSMBMG-UHFFFAOYSA-N;
	SMILES [Ag]O[Ag].O=[Ag]O[Ag]=O;
Properties
Chemical formula	Ag4O4; Ag2O.Ag2O3
Molar mass	123.87 g/mol
Appearance	grey-black powder ; diamagnetic
Density	7.48 g/cm3
Melting point	>100 °C, decomposition
Solubility in water	.0027 g/100 mL
Solubility	soluble in alkalis
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H315, H319, H335
NFPA 704 (fire diamond)	3 0 1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Silver(I,III) oxide or tetrasilver tetroxide is the inorganic compound with the formula Ag₄O₄. It is a component of silver zinc batteries. It can be prepared by the slow addition of a silver(I) salt to a persulfate solution e.g. AgNO₃ to a Na₂S₂O₈ solution. It adopts an unusual structure, being a mixed-valence compound. It is a dark brown solid that decomposes with evolution of O₂ in water. It dissolves in concentrated nitric acid to give brown solutions containing the Ag²⁺ ion.