Name | TANTALUM PENTAFLUORIDE |
Synonyms | TaF5 TANTALUM FLUORIDE TANTALUM(V) FLUORIDE tantalumfluoride(taf5) TANTALUM PENTAFLUORIDE Tantalum fluoride (TaF5) |
CAS | 7783-71-3 |
EINECS | 232-022-3 |
Molecular Formula | F5Ta |
Molar Mass | 275.94 |
Density | 4.74g/mLat 25°C(lit.) |
Melting Point | 96.8 °C |
Boling Point | 229.5 °C |
Flash Point | 230°C |
Water Solubility | Decomposes in water forming tantalum oxyfluoride. Soluble in conc. and fuming HNO{3}Soluble in carbon disulfide, carbon tetrachloride and chloroform. Slightly soluble in acetic acid and ethanol. |
Appearance | Powder |
Specific Gravity | 4.740 |
Color | off-white |
Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3 |
Merck | 14,9055 |
Sensitive | 7: reacts slowly with moisture/water |
Physical and Chemical Properties | Tantalum pentafluoride is a volatile, moisture-absorbing, white monoclinic crystal. Relative density 5.1, lattice constants a = 0.964 nm, B = 0.512 nm,c = 96.30. Melting point 95.1 ℃, boiling point 229.2 ℃. The evaporation heat is 54.4 kJ/mol and the melting heat is 18.8 kJ/mol. When the temperature is in the range of 80~230 ℃, the relationship between vapor pressure and temperature is lgp = 27.649-2834/T(p is kPa). Easily soluble in water, ether, slightly soluble in hot carbon disulfide and carbon tetrachloride and cold concentrated sulfuric acid. Intense reactions occur in sodium hydroxide solution. Tantalum pentafluoride does not react with bromine, iodine, nitrogen, etc. even in the boiling state. |
Hazard Symbols | C - Corrosive |
Risk Codes | 34 - Causes burns |
Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S27 - Take off immediately all contaminated clothing. S28 - After contact with skin, wash immediately with plenty of soap-suds. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
UN IDs | UN 3260 8/PG 2 |
WGK Germany | 3 |
RTECS | WW5775000 |
TSCA | Yes |
Hazard Note | Corrosive |
Hazard Class | 8 |
Packing Group | II |
EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
Uses | Used for chemical vapor deposition and ion implantation doping of tantalum, and also used for organic compound synthesis catalysts. |
production method | direct method to prepare tantalum pentafluoride from tantalum powder and fluorine: use monel alloy or nickel L-shaped tube as the reaction tube, First, vacuum is drawn from one end of the tube to remove air and moisture in the tube, then metal tantalum powder is added to the end, and then this end is put into an electric furnace, put the other end into the semi-melted dry ice, and control the electric furnace to raise the temperature to 300°C. At this time, fluorine gas is introduced into the reaction tube. After the reaction, a solidified solid tantalum pentafluoride powder is generated at the dry ice. The reaction product is vacuum distilled and collected at -10°C to obtain 99% tantalum pentafluoride. Under the condition of high vacuum, sublimate at 90~100 ℃ to obtain refined tantalum pentafluoride. The product must be stored in a dry glass borosilicate container and sealed. The synthesis method uses tantalum pentachloride and anhydrous hydrofluoric acid as raw materials to prepare tantalum pentafluoride: at room temperature, tantalum pentachloride reacts with anhydrous hydrofluoric acid, and after the reaction, it is condensed and filtered to obtain solid tantalum pentafluoride, And then sublimate under vacuum to produce refined tantalum pentafluoride. |