Tantalum oxide , 99.99%MetalsBasis for optical glass , 1314-61-0

Synonym(s):
Tantalum pentoxide

CAS NO.：1314-61-0

Empirical Formula: O5Ta2

Molecular Weight: 441.89

MDL number: MFCD00011254

EINECS: 215-238-2

PRODUCT Properties

• Melting point: 1872 °C
• Density: 8.2 g/mL at 25 °C(lit.)
• storage temp.: Sealed in dry,Room Temperature
• solubility: insoluble in H2O, ethanol, acid solutions; sHF
• form: lumps
• color: White to white-beige
• Specific Gravity: 8.2
• Resistivity: 1.0 ∞ 10*12 (ρ/μΩ.cm)
• Water Solubility: Insoluble in water.
• Crystal Structure: Trigonal
• crystal system: Nogata
• Merck: 14,9056
• Space group: Pmm2
• Lattice constant:
  • a/nm: 0.3888
  • b/nm: 4.029
  • c/nm: 0.6198
  • α/o: 90
  • β/o: 90
  • γ/o: 90
  • V/nm3: 0.9709
• Dielectric constant: 11.6（Ambient）
• Exposure limits: OSHA: TWA 5 mg/m3; NIOSH: IDLH 2500 mg/m3; TWA 5 mg/m3; STEL 10 mg/m3
• InChI: InChI=1S/5O.2Ta
• InChIKey: PBCFLUZVCVVTBY-UHFFFAOYSA-N
• SMILES: [Ta](=O)(=O)O[Ta](=O)=O

Description and Uses

Tantalum pentoxide is used in making high refractive index optical glass; as a dielectric film on tantalum for its use as a capacitor component and rectifier; and for preparing tantalum metal, its carbide, and many other tantalum compounds.

Safety

• Symbol(GHS): GHS07
• Signal word: Warning
• Hazard statements: H320
• Precautionary statements: P264-P337+P313-P305+P351+P338
• Hazard Codes: Xi
• Risk Statements: 36/37/38
• Safety Statements: 37/39-26
• WGK Germany: -
• RTECS: WW5855000
• TSCA: Yes
• HS Code: 28259085
• Toxicity: LD50 orally in rats: 8000 mg/kg (Cochran)