TUNGSTEN (IV) OXIDE
Synonym(s):Tungsten dioxide
- CAS NO.：12036-22-5
- Empirical Formula: O2W
- Molecular Weight: 215.84
- MDL number: MFCD00049709
- EINECS: 234-842-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-08-28 13:53:24
What is TUNGSTEN (IV) OXIDE?
Description
Tungsten(IV) oxide, WO2, is a bronze-colored solid that crystallizes in a monoclinic cell. The rutile-like structure features distorted octahedral WO6 centers with alternate short W-W bonds (248 pm). Each tungsten center has the d2 configuration, which gives the material a high electrical conductivity. WO2 is prepared by reduction of WO3 with tungsten
powder in about 40 h at 900℃. An intermediate in this reaction is the partially reduced, mixed valence species W18O49.
2WO3 + W→3WO2
Chemical properties
brown powder(s), may become purple on standing; formed when WO3 is reduced by H2 at 575°C–600°C [KIR83] [STR93]
The Uses of TUNGSTEN (IV) OXIDE
Tungsten(IV) oxide is used in the production of tungsten and tungstates, in alloys, in fire-proofing fabrics and as a ceramic pigment. It is used to study their chromism, photocatalysis and sensing capabilities. It is associated with rhenium trioxide particles and used for detection of protonatable, radical and precharged species under laser desorption ionization.
Properties of TUNGSTEN (IV) OXIDE
| Melting point: | 1500-1600°C |
| Boiling point: | 1730℃[at 101 325 Pa] |
| Density | 12,11 g/cm3 |
| solubility | insoluble in H2O, organic solvents |
| form | Powder |
| color | brown |
| Specific Gravity | 12.11 |
| Water Solubility | Soluble in acid and potassium hydroxide. Insoluble in water. |
| Exposure limits | ACGIH: TWA 3 mg/m3 NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 |
| CAS DataBase Reference | 12036-22-5(CAS DataBase Reference) |
| EPA Substance Registry System | Tungsten oxide (WO2) (12036-22-5) |
Safety information for TUNGSTEN (IV) OXIDE
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P405:Store locked up. P403+P233:Store in a well-ventilated place. Keep container tightly closed. |
Computed Descriptors for TUNGSTEN (IV) OXIDE
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