Exploring Tungsten Trioxide Crystal Structure

The crystal structure means the crystal of microstructure; it actually refers to the crystal particles (atoms, ions or molecules) arranged in specific circumstances. Solid substances existing in nature can be divided into two categories crystalline and amorphous, solid metals and alloys are large crystals. The most essential difference between the crystalline and the amorphous crystal is composed of atoms, ions, molecules and other particles are regularly arranged (long program), and not a crystal in addition to these particles with its closest outer. Metals and alloys are in a crystalline state to use in most cases. The crystal structure is one of the basic factors that determine the physical, chemical and mechanical properties of solid metal.

In order to explore the crystal structure of tungsten trioxide, we strictly follow the stoichiometric ratio of crystal structure to test the crystal structure of the tungsten trioxide whether meets distorted perovskite structure. It shows that A cation vacancy occurs; and the central atom of oxygen octahedron located in the octahedron.

In addition, we find that all the tungsten trioxide single crystal phase can be seen as octahedral structure, but at a certain structure twisted structure occurred. Since tungsten trioxide varying degrees of oxygen deficiency, and it becomes more complex, so the chemical formula of the tungsten trioxide WO_3-X generally written as the type. With the increase in the number of oxygen vacancies, which are distributed in the crystals of WO_3-X has become the order to form so-called trimming surface. When X <0.02, these shear surfaces are randomly distributed; when X≥0.02, the shear surface is arranged parallel to each other showing the trend, the degree of ordering trimming surface is also increasing with the increasing degree of reduction of arrangement. These compounds have different crystal structures and vacancies, and the tungsten trioxide has a variety of properties that are not the same.

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