Back پنتاوکسید تانتال AZB Pentaòxid de tàntal Catalan Oxid tantaličný Czech Tantal(V)-oxid German Pentóxido de tántalo Spanish پنتاکسید تانتال Persian Tantaalipentoksidi Finnish Oxyde de tantale(V) French תחמוצת טנטלום HE टंटलम पेन्टाऑक्साइड Hindi
 | |
| Names | |
|---|---|
| IUPAC name
Tantalum(V) oxide
| |
| Systematic IUPAC name
Ditantalum pentaoxide | |
| Identifiers | |
3D model (JSmol)
|
|
| ChemSpider | |
| ECHA InfoCard | 100.013.854 |
PubChem CID
|
|
| UNII | |
CompTox Dashboard (EPA)
|
|
| |
| |
| 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).
| |
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.
- ^ Reisman, Arnold; Holtzberg, Frederic; Berkenblit, Melvin; Berry, Margaret (20 September 1956). "Reactions of the Group VB Pentoxides with Alkali Oxides and Carbonates. III. Thermal and X-Ray Phase Diagrams of the System K2O or K2CO3 with Ta2O5". Journal of the American Chemical Society. 78 (18): 4514–4520. doi:10.1021/ja01599a003.
- ^ Fairbrother, Frederick (1967). The Chemistry of Niobium and Tantalum. New York: Elsevier Publishing Company. pp. 1–28. ISBN 978-0-444-40205-9.