Violet Tungsten Oxide(VTO)

Violet Tungsten Oxide Picture

What is Violet Tungsten Oxide ? Violet tungsten oxide is named by its violet crystalline powder appearance, shorted for VTO.

Chinese Name:紫色氧化钨;紫钨
English Name: Violet Tungsten Oxide
Abbr: VTO
Chemical Formula: WO2.72 or W18O49
Molecular Weight: 227.36
HS Code: 2825901990
Appearance: Violet fine crystalline powder
Solubility (water): Insoluble
Solubility (Other solvent): Insoluble in alcohol and most of acid, soluble in ammonia water, alkali solution

Preparation of Violet Tungsten Oxide

Violet tungsten oxide is manufactured under a certain reduction condition from the raw materials of ammonium paratungstate (APT), tungstic acid or tungsten trioxide (WO3). The preparation methods of violet tungsten oxide are mainly APT wet hydrogen direct reduction, tungstic acid hydrogen reduction and APT mild reduction method ect.

Application of Violet Tungsten Oxide

Due to the special needle-like or columnar crystal structure of the violet tungsten oxide, and the richer cracks than the other tungsten oxide particles (All of the tungsten oxide grains are rich in cracks), this structure has a large gap which makes its low bulk density, and thus to conducive to the reduction or other reactions. The applications of violet tungsten oxide are as follows:
1. Prepare tungsten powder, especially the production of nano, submicron or super-fine tungsten powder;
2. To apply in the gas sensor, to show a good gas sensitive to nitrogen dioxide (NO2) under room temperature;
3. The preparation of tungsten carbide, super-fine WC-Co powder.
4. Used as raw material for lithium ion battery cathode to improve its performance.

WO2.72 Specification

Grade:A1 WO2.72 Content(%Min):95.00 WO3 Content(%min):5.00
Density:1.75g/cm3 F.S.S.S.:10-18um
Element Sn S Cu Mo Bi As P Si Ca Mn Pb Fe
MAX 0.00005 0.0005 0.0010 0.00005 0.0005 0.0005 0.0005 0.0005 0.0001 0.00005 0.0005 0.0002
Element Ti Mg Na K Cr V Co Ni Sn Al Cd Sb
MAX 0.0002 0.0002 0.0004 0.0006 0.0002 0.0002 0.0002 0.0002 0.0002 0.0002 0.00005 0.0001