Tungsten Oxide
Tungsten oxide is an inorganic chemical compound. It incluldes tungstic acid (H2WO4), yellow tungsten oxide (YTO, WO3), blue tungsten oxide (BTO, WO2.9), violet tungsten oxide (VTO, WO2.72or W18O49), brown tungsten oxide(tungsten dioxide, WO2) and cesium tungsten bronze (Cs0.33WO3).
Micron grade tungsten oxides are mainly used as the raw material in production of tungsten powder, tungsten carbide powder, catalyst, lubricant, ceramic painting, etc.. Nano grade tungsten oxides has large specific area and significant surface effect, is usually used as heat insulating liquid material, anode material for lithium ion battery, semiconductor, solar battery electric silver liquid, etc..
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Ammonium paratungstate (APT) is white crystalline powder, insoluble in water.
Ammonium metatungstate is white powder, soluble in water, solubility is 300g WO3/100ml H2O (in 25℃).
Sodium tungstate is an intermediate tungstate produced from tungsten concentrate, is the raw material for APT.