I want to understand better what happens with the results of a XRD test on a pure Nickel powder with a Cu tube. If possible, I would like to discuss the possibilities of analyzing a sample with, and without a Ni filter.
Hello Marina Penna Goncalves ,
XRD determines the crystal structure of the sample. If you do a test with Nickel, it will show you a pattern for the Nickel crystal structure, which is a FCC cubic, Fm-3m space group, and I presume the pattern will be something like the one I attached.
If you want to determine the presence of Nickel in another sample, you can try to use Rietveld Refinement, in which we try to determine the presence of Nickel pure phase in a sample, using the XRD pattern.
Feel free to reply and ask if you need help.
Best regards,
Ricardo Tadeu
Hi Ricardo,
Yes, I understand that, it makes sense. But because of the x-ray absorption edge of Ni, the interaction won't be ideal depending on the settings. So if I have a Cu source with, and without a monochromatic filter, I expected a different pattern. I want to know better how this configuration would affect my results.
Best,
Marina
Hi Marina,
The monochromator and filters are used to reduce the presence of the K beta and Kalpha2 radiations emitted from Copper or another anode. I simulated a Nickel powder pattern considering you have successfully blocked those 2 radiation and only Kalpha1 hit our sample .
You have only 6 peaks if you hit your sample with K alpha1. If Kalpha2 isn't blocked, you will have more peaks, which are correspondent to the same "original" 6 you had for K alpha1. Also, if K Beta is not blocked (I considered K beta wavelength = 1.3922, according to https://www.iucr.org/education/pamphlets/2/full-text), your pattern is completely different because you are seeing repeated crystal planes for every radiation you have.
Check this:
http://pd.chem.ucl.ac.uk/pdnn/inst1/filters.htm
Basically, the less different radiation hit your sample, the better.
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