Nanometer blue tungsten oxide, which may be applied for producing heat insulating window glass, does not necessarily have a good doping effect. That is because only blue tungsten oxide powder produced by the monoclinic hexagonal structure of ammonium paratungstate (APT) has a good doping effect. That is to say, the needle-like or polygonal crystal ammonium paratungstate does not satisfactorily meet the requirements of the doped tungsten wire.
The reason why nano grain size blue tungsten oxide powder produced by the monoclinic hexagonal structure of ammonium paratungstate has a good doping effect is that the hexagonal plate-like APT has large specific surface area, high activity and many cracks on the crystal surface. At the same time, blue tungsten oxide and the skeleton structure of APT is closely related, and the skeleton of APT is still retained, so that more alkali metal ions K+ can be adsorbed, thereby greatly improving the doping effect.
More details, please visit:
http://www.tungsten-powder.com/Blue-Tungsten-Oxide.html
