Hello,
Using the Scherrer's equation, one could calculate, roughly, the crystalline size of ZIF-8. However, I am confused as to which peak in the XRD pattern should be taken for the calculation? If I take a peak at 2theta=7.4, I get a different size than if I take it at 2theta=14.8. Any help is appreciated. I know how the scherrer's equation is calculated, just asking which peak to choose.
If you get different size by applying Scherrer's equation to different peaks, that simply means that this equation is not applicable to your material. In other words, the size of crystallites is not the only (and probably even not the most important) source of the peak broadening. In this situation you have to move to more modern approaches to the microstructure analysis.
Adam da
The Scherrer formula only gives a single (which cannot be a 'mean' value) value for application of the formula when we know that there's actually a distribution of crystallite sizes. Also, do not confuse 'crystalline' with 'crystallite' plus Scherrer should always be in upper case as it's the name of a person...
As Alexander states above, you may look for other techniques (e.g. Williamson-Hall) that deal with other causes of line broadening (stress/strain & instrumental). Take a look at the attached from NIST.
The Scherrer equation doesn't calculate a particle size appropriately.
In fact, is used to make a rough guess.
Usually, the Scherrer formula gives you a lower amount than TEM, SEM, DRS.
ZIF-8 usually depends on SEM or TEM.
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