I have an XRD pattern and SAED pattern for a powder sample where a very small fraction of minor phase is confirmed in XRD while that minor phase is not found in the SAED pattern.
- SAED will be a difficult analysis.
- Try Raman spectrocoopy, you should be able to detect additional Raman modes corresponding to the vibrations of the impurity oxide phase. Many a times, the presence of a minor phases which is not seen in XRD can be evidenced through Raman spectroscopy. But you have to carefully de-convolute your Raman spectra and analyse the results.
Can you estimate the size of the crystallites of the minor phase (by XRD)? Is it different from the major phase? Maybe you can use this information (if there are different sizes or shapes) for the identification by SAED and "serach" for crystallites of the minor phase during the investigation.
Indeevar Singh Consider how much sample is actually assessed with SAED in line with the heterogeneity of the system. In the entire history of SAED no more than a few grams of total material has been evaluated worldwide by all the researchers and instruments combined...
hi i am facing the similar issue where i can get clear xrd pattern of zno nanoparticles matching with jcpds data but the same materials TEM sead pattern is showing amorphous pattern. please let me know the solution how can I get good sead Tem pattern for my biogenic nanoparticles.
Awantika Singh Heat your material to 4000C and take another SAED pattern...
Alan F Rawle thanks for the reply but i have one query " at this high temperature, the physical properties of the nanoparticles will be affected and it will be changed from the original state". let me know another alternative for washing off biomaterial from nanoparticles.
Awantika Singh My remark referred only to obtaining a 'clean' SAED pattern. Yes, the properties of the system will be changed markedly by heating to 4000C. There are no free, discrete, independent particles < 100 nm in a powder. See (registration required):
Dispersion and nanotechnology
https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat
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