Tantalum pentoxide
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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.[2] It is also extensively used in the production of capacitors, due to its high dielectric constant.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Tantalum(V) oxide | |
Systematic IUPAC name
Ditantalum pentaoxide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.013.854 |
PubChem CID |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
Ta2O5 | |
Molar mass | 441.893 g/mol |
Appearance | white, odorless powder |
Density | β-Ta2O5 = 8.18 g/cm3[1] α-Ta2O5 = 8.37 g/cm3 |
Melting point | 1,872 °C (3,402 °F; 2,145 K) |
negligible | |
Solubility | insoluble in organic solvents and most mineral acids, reacts with HF |
Band gap | 3.8–5.3 eV |
−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).
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