The grain size of polycrystalline tungsten oxide can vary from a few nanometers to a few microns. The exact grain size depends on the material preparation method, processing conditions, and grain growth mechanism.
In general, the grain size of polycrystalline tungsten oxide is usually between tens and hundreds of nanometers. However, through appropriate preparation and processing methods, smaller sized grains can be achieved, such as nanocrystalline tungsten oxide, whose grain size is usually between a few to tens of nanometers.
It should be noted that the measurement method of grain size will also affect the results. Common measurement methods include X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Different measurement methods and analysis techniques may result in slight variances.
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