Tantalum pentoxide

Tantalum pentoxide
Names
	IUPAC name Tantalum(V) oxide
	Systematic IUPAC name Ditantalum pentaoxide
Identifiers
CAS Number	1314-61-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	452513 ;
ECHA InfoCard	100.013.854
PubChem CID	518712;
UNII	OEZ64Z53M4 ;
CompTox Dashboard (EPA)	DTXSID10893849 ;
	InChI InChI=1S/5O.2Ta;
	SMILES O=[Ta](=O)O[Ta](=O)=O;
Properties
Chemical formula	Ta2O5
Molar mass	441.893 g/mol
Appearance	white, odorless powder
Density	β-Ta2O5 = 8.18 g/cm3 ; α-Ta2O5 = 8.37 g/cm3
Melting point	1,872 °C (3,402 °F; 2,145 K)
Solubility in water	negligible
Solubility	insoluble in organic solvents and most mineral acids, reacts with HF
Band gap	3.8–5.3 eV
Magnetic susceptibility (χ)	−32.0×10−6 cm3/mol
Refractive index (nD)	2.275
	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

Tantalum pentoxide, also known as tantalum(V) oxide, is the inorganic compound with the formula Ta
₂O
₅. It is a white solid that is insoluble in all solvents but is attacked by strong bases and hydrofluoric acid. Ta
₂O
₅ is an inert material with a high refractive index and low absorption (i.e. colourless), which makes it useful for coatings. It is also extensively used in the production of capacitors, due to its high dielectric constant.