Solid Method Influence Tungsten Trioxide Structure (1)

After the study found that tungsten trioxide producing method, reaction conditions, there will affect the structure and properties of the product. At the same time, the different precursor also has some impact on producing WO3. Depending on the reaction environment of raw materials, methods for producing WO3 can be roughly divided into solid, liquid and gas phase method.

Solid-phase method is a traditional powder technology, using solid-phase for producing tungsten trioxide is usually obtained by calcination APT, but due to different firing conditions there was not the same reactant. Such as at 400 ℃condition calcinate APT with oxidizing atmosphere will obtain an orange powder. And it is characterized by XRD as black bronze (NH4) 0.33WO3 which also contains sixty WO3. Continued calcination at 500 ℃ for 2 hours, the resulting yellow-green product, XRD characterization of monoclinic WO3. In at 400 ℃ with reducing atmosphere calcined APT will obtain blue tungsten oxide. It is a mixture of bronze ATB, WO3, WO2.9, W2.72, W3O other phase composition.

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