Tungsten Trioxide Crystal Structure

Tungsten trioxide crystal structure satisfies stoichiometric ratio strictly should be distorted perovskite structure, namely the absence of cation A pattern appears in the ABO3 perovskite structure. Oxygen atom is octahedron, and a tungsten atom in the center of the octahedron. All single phases of tungsten are octahedral structure but the structural is different. Since tungsten trioxide varying degrees of oxygen vacancy and therefore the stoichiometric become more complicated, so that the tungsten trioxide chemical formula is usually written as WO3-X. With the increase in the number of oxygen vacancies, which are distributed in the crystals of WO3-X becomes ordered together, a so-called shear surface. When X <0.02 the shear surface is randomly distributed. When X≥0.02 shear surface become parallel arranged, with the increasing degree of reduction of the degree of ordering shear surface arrangement is also increasing. These compounds have different crystal structures, and vacancies, such that the tungsten trioxide having a variety of properties, photocatalytic activity which has not the same.

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