The grains of polycrystalline tungsten oxide exist in the form of polycrystals, which consist of many grains. Each grain has its own crystal structure and crystal orientation, and the grains are separated from each other by grain boundaries.
In polycrystalline tungsten oxide, the arrangement of grains is random. Grains vary in size, shape, and orientation due to the crystallization process and the formation of grain boundaries during material preparation.
The grain arrangement of polycrystalline tungsten oxide usually presents granular, polyhedral or irregular shapes. The grains are connected together by grain boundaries, which are the interface regions between adjacent grains. Grain boundaries have different structures and properties, and they play an important role in the physical and chemical properties of materials.
It should be noted that the arrangement of polycrystalline tungsten oxide grains is random, and the size and shape of the grains will vary due to different preparation conditions and treatment processes. This is also one of the main reasons for the differences in structure and properties between polycrystalline materials and single crystal materials.
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