Tungsten Trioxide Complex Characterization

TG (Thermal Gravity Analysis) is a term of thermodynamics, called thermal gravimetric analysis. Its meaning is: The sample in the specified temperature curve (rate), the rate decreases with its weight / ratio analysis. From the curve we can know the weight of sample reducing at certain temperature, and then it shows that the decomposition temperature of the sample at this occurrence (or other chemical reactions) is the most severe. TG Category 1, static method (isothermal): sample at a constant temperature, known as the "constant weight loss." TG Category 2, the dynamic method (temperature method): the sample under constant temperature, known as "TGA curve."

During the inspection process, the first steep, placing synthetic product in a muffle furnace, burning it 3h at 400 ℃ to obtain the tungsten trioxide powder samples of different doping amount of tungsten trioxide, and then getting the results via TG at FIG 50-400 ℃, characterizing it by the percentage change to determine the tungsten trioxide complex. From the TG graph , we can see when the temperature reaches at 350 ℃ , TG curve is approximately straight line, which indicates that synthesis product is lost when the temperature is about 350 ℃ . Weight of the synthetic product constantly decreases with temperature increasing.

Next, the synthesized product was characterized by X-ray powder diffraction analysis, the diffraction peaks can be found in standard synthetic products that were monoclinic phase product coincide, and there are not impurity peaks, which show the composite tungsten oxide does not cause polymorphs variety. In summary, the tungsten trioxide complex becomes into the admixture does not have a change in crystal form molybdenum trioxide.