Contact us: +91 9550333722 040 - 40102781
Structured search
India
Choose your country
Different countries will display different contents
Try our best to find the right business for you.
My chemicalbook

Welcome back!

HomeProduct name listTungsten trioxide

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
Tungsten trioxide Structural

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)
ghs
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

Related products of tetrahydrofuran

You may like

Statement: All products displayed on this website are only used for non medical purposes such as industrial applications or scientific research, and cannot be used for clinical diagnosis or treatment of humans or animals. They are not medicinal or edible.