Polycrystalline zeolitic phase

Specifically for the preparation of zeolite films, zeolite nanoparticles could be used directly to form zeolite films by self-assembly. They could also be combined nicely with the seeded growth and vapor phase transport method to produce high quality polycrystalline zeolite films. There is clear evidence that small zeolite nanoparticles are preferred for producing compact continuous films. 

Since most zeolites are only available as polycrystalline phases, powder diffraction is an essential structural characterization technique. A powder diffraction pattern can be used to identify a material, to determine unit cell parameters, to estimate the quality of a sample, to monitor phase transitions, to evaluate whether or not a post-synthesis treatment has induced structural changes, to establish whether or not impurities (amorphous or crystalline) are present, or to recognize the presence of a significant level of faulting. 

---