Tungsten Trioxide Electrical Properties

Tungsten trioxide formula is WO3 and a molecular weight is 231.85. WO3 formula is fairly simple, but its physical nature is very complex. Tungsten trioxide satisfies the stoichiometric ratio and no impurities should be colorless and transparent insulator. But the oxygen content of WO3 is usually not meet strict stoichiometric ratio, because it is difficult to control the oxygen content of the preparation, together with other complex factors, the type of WO3-X so represented. In 1959, Sawada and Danielson reported resistivity measurements performed on single crystals WO3 results p = 1.7 × 10-1Ω • cm. In 1983 Sahle and Nygren reported conductivity measurement of WO3-X (0≤y≤0.28)series single crystal. With the study of tungsten trioxide electrical properties we found that for WO3-x single crystals, their electrical properties change with the structure and oxygen content can be separately presented metal or semiconductor behavior. Ferroelectric behavior is an extremely important electrical property of WO3 material. WO3 crystal is a ferroelectric material and the ferroelectric temperature is Tc = -40 ℃.

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