In polycrystalline tungsten oxide, grain boundaries are the interfaces or boundaries between adjacent grains. Grain boundaries are caused by discontinuities in the arrangement of atoms or molecules.
Grain boundaries exist between different grains in a crystal, and they can be grains of the same material or grains of different materials. Grain boundaries can be parallel to the crystal surface, or they can be formed inside the crystal.
The nature and structure of grain boundaries can have an important impact on the properties of materials. Grain boundaries can affect the mechanical properties, electrical conductivity, thermal conductivity, etc. of materials. There are structural defects at the grain boundary, such as dislocations, dislocation accumulation, etc. These defects may lead to the reduction of the strength of the crystal and the obstruction of the transport of electrons or heat.
In addition, grain boundaries can also act as interfaces in a material, affecting how the material interacts with its surroundings. Grain boundaries can affect the chemical reaction, surface activity, and adsorption and diffusion behavior of materials to the outside world.
Therefore, studying the structure, properties and interactions of grain boundaries is of great significance for understanding the properties and applications of polycrystalline tungsten oxide.
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