Tungsten trioxide (WO3) is a common inorganic compound, which has a variety of crystal structures, the most common of which are monoclinic crystal structure and hexagonal crystal structure. Although monoclinic and hexagonal structures are the most common crystal structures of tungsten trioxide, it can also form other different structure types under certain conditions.
Tungsten trioxide monoclinic crystal structure
The monoclinic crystal structure is the most common crystal structure of tungsten trioxide. In this structure, tungsten atoms form a layered octahedral structure, and the octahedrons are connected by oxygen atoms. How the octahedral layers are stacked affects the properties of the crystal. In the monoclinic structure, each octahedral layer is parallel to the (001) plane of the crystal, and there is some slip between adjacent layers.
Tungsten trioxide hexagonal crystal structure
In addition to the monoclinic structure, tungsten trioxide can also form a hexagonal crystal structure. In the hexagonal crystal structure, tungsten atoms form close-packed hexagons, while oxygen atoms fill the spaces between the hexagons. This structure has high symmetry and density.
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