In production, for controlling and measurement, the number of crystal water molecules should be determined, which is the primary reason for APT and AMT thermal analysis studies. Secondly, it can be seen from the above equation that NH4+ of APT crystallization shall be pyrolysis controlled within the required content, and then formed AMT by the hydration. The important factor to control the ammonium ion content is the pyrolysis temperature, the temperature mentioned in the information varies because of different pyrolysis equipments; the weight loss rate mentioned also has a wide range of variation. Thermal analysis is one of the effective methods for it. Finally, the reason for APT and AMT thermal analysis is that the optimum control temperature is required when producing tungsten trioxide by APT and AMT or their doping products.

 

From the perspective of quantitative analysis, according to the thermal gravimetric analysis curves of APT and AMT (the TG curve), their crystal water molecules can be determined; according to their differential curve, the starting temperature of each stage of pyrolysis can be determined. Method of calculating the number of crystallization water molecules: 1 Give thermal decomposition chemical reaction; 2. Give the weight loss equation; 3. Extract Formula unknowns.