Tungsten Trioxide Classification

Tungsten oxide (YTO), also known as yellow tungsten oxide, formula WO₃, is the main tungsten oxide product in China in the 1980s. It is a yellow powder that is insoluble in water, soluble in alkali and slightly soluble in acid. Its density is 7.16 g / cm³; its melting point is 1473 °C; its boiling point is about 1700 °C. Mainly used in the system of high melting point alloys and cemented carbide, tungsten wire and fire gas sensitive materials, but also for photocatalyst materials.

The photocatalytic degradation in recent years is a highly respected push pollution control technology, compared with other methods, this method has high efficiency and energy saving, clean non-toxic, no two pollution and simple process, is in the sewage treatment and water depth processing and wide application prospect.  Nanoscale tungsten trioxide and amorphous tungsten trioxide film has good photocatalytic properties, with visible light can achieve better degradation, not only is tungsten trioxide itself, tungsten tungstate based on tungsten trioxide-based materials, bismuth tungstate and other tungstates are also the main forces of the photocatalytic army.

Microwave absorbing materials and materials have good absorption properties for electromagnetic waves, and have good dielectric properties with other oxides formed. The dielectric behavior of this kind of ceramics under microwave is an important component material for mobile communication and satellite communication.

Varistor material, although tungsten trioxide nonlinear is not very strong, but has high dielectric constant, so there are still suitable for its performance, nonlinear devices such as working under low voltage, in order to improve the performance of WO₃ varistors, scholars have conducted research on tungsten based ceramic varistor material, it is mainly to change the dopant, the content of impurities and the sintering temperature. Some conclusions have been made that the addition of appropriate amount of Co₂O₃ in the WO₃-Na₂CO₃-MNO₂ system can improve its nonlinear performance and can be made into ceramic capacitors.

Photochromism, the material under the action of an external electric field, the color change is called electrochromism, tungsten trioxide is the most studied electrochromic materials. Since the discovery of the electrochromism of tungsten trioxide films at room temperature, scientists have done a lot of research and achieved many fruitful results. The electrochromic effect makes it possible to be used as thermal control coating material for smart glass, automotive glass and spacecraft. In addition, it is also expected to be applied to high-density storage, image display, laser printing and optical switching devices.

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