Tungsten trioxide
Synonym(s):Tungsten trioxide nanowires;Tungstic anhydride
- CAS NO.:1314-35-8
- Empirical Formula: O3W
- Molecular Weight: 231.84
- MDL number: MFCD00011466
- EINECS: 215-231-4
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-10-25 23:13:37
What is Tungsten trioxide?
Chemical properties
Canary-yellow, heavy powder, darkorange when heated and regains original color on cooling. Insoluble in water, soluble in caustic alkalies, soluble with difficulty in acids. Noncombustible.
Physical properties
Heavy yellow powder; turns dark orange on heating; reverts back to yellow on cooling; density 7.2 g/cm3; melts at 1,472°C; insoluble in water; slightly soluble in acids; soluble in caustic alkalies.
The Uses of Tungsten trioxide
manufacture of tungstates which are used for x-ray screens and for fireproofing fabrics.
The Uses of Tungsten trioxide
Tungsten oxide (WO3) is used to make tungsten alloys. Tungsten oxide is also used as fireproofing for various surfaces and is used as a yellow pigment in ceramics.
The Uses of Tungsten trioxide
It is used in tungsten and tungstate manufacturing which are used as X-ray screens and for fire proofing fabrics. It is used as a ceramic pigment. Nanowires of Tungsten (VI) oxide are capable of absorbing a higher percentage of the sun radiation since it absorbs blue light.
Preparation
Tungsten trioxide is obtained as an intermediate in recovery of tungsten from its minerals (See Tungsten). In commerical processes tungstic acid, H2WO4, obtained from the mineral scheelite, may either be decomposed at high temperatures to form trioxide or dissolved in ammonium hydroxide solution and evaporated to yield ammonium paratungstate (APT) crystals, 5 (NH4)2O?12WO3?11H2O. The APT crystals are then washed, dried, and calcined at elevated temperatures to form tungsten trioxide
Tungsten trioxide, in general, can be made by heating metallic tungsten, its carbides, its lower oxides, or tungstic acid in air.
General Description
Tungsten(VI) oxide (WO3) is a semiconducting material with excellent electrochromic properties. It is a cost efficient material with a high optical modulation. It can be synthesized by a variety of methods which include chemical vapor deposition, electrodeposition, and other sol-gel based coating processes.
Hazard
Toxic material.
Flammability and Explosibility
Not classified
Safety Profile
Moderately toxic by ingestion. Can react violently with ClF3, Li, Cl2. See also TUNGSTEN COMPOUNDS.
Structure and conformation
The crystal structure of tungsten trioxide is temperature dependent. It is tetragonal at temperatures above 740℃, orthorhombic from 330 to 740 °C, monoclinic from 17 to 330 °C, triclinic from -50 to 17 °C, and monoclinic again at temperatures below -50 °C.The most common structure of WO3 is monoclinic with space group P21/n.
Properties of Tungsten trioxide
Melting point: | 1470-1475 °C |
Boiling point: | 1837°C (estimate) |
Density | 7.16 g/mL at 25 °C(lit.) |
storage temp. | Room Temperature |
solubility | insoluble in H2O, organic solvents; slightly soluble in acid solutions; soluble in alkaline solutions |
form | powder |
color | Yellow to greenish-yellow |
Specific Gravity | 7.16 |
Water Solubility | insoluble |
Merck | 14,9817 |
Exposure limits | ACGIH: TWA 3 mg/m3 NIOSH: TWA 5 mg/m3; STEL 10 mg/m3 |
CAS DataBase Reference | 1314-35-8(CAS DataBase Reference) |
NIST Chemistry Reference | Tungsten trioxide(1314-35-8) |
EPA Substance Registry System | Tungsten trioxide (1314-35-8) |
Safety information for Tungsten trioxide
Signal word | Warning |
Pictogram(s) |
Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H302:Acute toxicity,oral |
Precautionary Statement Codes |
P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P270:Do not eat, drink or smoke when using this product. P330:Rinse mouth. |
Computed Descriptors for Tungsten trioxide
InChIKey | ZNOKGRXACCSDPY-UHFFFAOYSA-N |
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