How the EDX results significant with the stoichiometry? Please anyone explain this and provide the appropriate references?
Yogendra Yadawa
EDX results contain usually weight percentage and atom percentage of the elements present in the sample. By analyzing the atom %, we can understand the compound/phase. For eg., if EDS analysis give approx. 66%Al and 33%Cu, then the phase is possibly CuAl2. We can also convert to eqvt wt% for verification.
https://www.researchgate.net/post/Interpretation_and_description_about_SEM-EDX
EDS quantification assumes that the sample is sample is homogeneous, flat, and thick (compared to the excitation range).
See here:
https://www.youtube.com/watch?v=et9CTYHUoos&app=desktop
Advanced Spectrum Analysis and Quantification Precision
This presentation by Dr. Jens Rafaelsen was recorded on the EDAX booth at M&M 2018
At 35:45 “If your sample doesn't meet those requirements: don't click the QUANT button: You'll get numbers, they'll be garbage!”
For reviews see here:
https://diposit.ub.edu/dspace/bitstream/2445/32146/1/MT04%20-%20Electron%20Probe%20Microanalysis%20_ed2.pdf
https://www.researchgate.net/publication/341645248_Electron_probe_microanalysis_A_review_of_recent_developments_and_applications_in_materials_science_and_engineering
A forum devoted to quantification of EDS is here:
https://probesoftware.com/smf/index.php
Dear Dr. Yogendra Yadawa
I am an Ex- SEM specialist. The EDAX results may be incorrect due to misusage of the suitable detector or the device not being calibrated by at least three elements (Cu, Al, C). Especially in case of, the results don't reflect the existance of the elements used.
Also, if the % not correct. This means the used ETH is not sufficient to excites the electrons of the outermost shell. So, revise the each element profile and the used ETH.
I hope this can help you.
You are welcomed for any furthur questions.
Best,
Mohamed
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