WO6 octahedral crystal structure is the ideal structure of tungsten trioxide, the interior materials are always varying degrees of oxygen vacancy, and thus its crystal structure is more complex; with the increase in the number of oxygen vacancies, internal distribution of tungsten trioxide crystals become orderly, forming a so-called shear plane. The physical property of tungsten trioxide is very complex, WO₃ which meet the strict stoichiometry and without any impurity should be colorless and transparent insulator with the band gap of 2.9eV at room temperature. The WO_3-y ceramic of non-stoichiometric behaves n-type semiconductor, with the band gap of 2.4~2.8eV, and the color varies from light yellow to yellow-green because of the different oxygen contents. 1959 reported that the WO₃ single crystal resistivity measurements ρ = 1.7 * 10-1Ω • m. while there is a very obvious conclusion is that as to the WO_3-y single crystal, its electrical properties turn to present metal or semiconductor behavior with the changing of its structure and oxygen content. Oxygen content largely determines the electrical properties of tungsten oxide.

 

Ferroelectric behavior as a very important electrical properties of WO₃, people have realized that WO₃ crystal is a ferroelectric material long before, its ferroelectric phase transition temperature is T = -40 ° C or -50 ° C. Under the same conditions, the dielectric constant of the ceramic nano WO₃ precursor is an order of magnitude increase higher than micro based WO₃ ceramics, while the sintering atmosphere of air can increase the dielectric constant for one order of magnitude. Polycrystalline WO₃ Ceramics is just like other varistors (ZnO, etc.), its non-linear electrically may be explained by the Schottky barrier model.

 

In addition, research on the magnetic of tungsten trioxide material is relatively little, mainly to clarify the corresponding electronic structure and electrical transport properties through the relevant magnetic measurements. Study found that such materials have Psuli type of paramagnetic; at the same time, the study of low-temperature tungsten trioxide crystalline structure of paramagnetic show that ultra-low temperature material situation did not appear superconductivity, and exhibit paramagnetic behavior.