Is it possible that XRD peak intensity decresing with increasing ion irradiation ?
It's possible that the energy from the irradiation is damaging the crystal structure of the sample you are using for XRD and so causing a decrease in the intensity of the diffraction peak.
The mechanism is likely to be a bit too complex to explain in detail, but the radiation is ionising radiation (X-rays), they will certainly produce what would be ionisations if they were produced in a gas. The relaxationof such energy could produce dislocations, imperfections in the lattice, vacancies or other crystalographic faults. This will disturb the coherency of the diffdraction peaks. It requires quite a length of ordered crystal to produce a distinct diffraction peak. For example, powder diffraction can only be done fi the powdered aprticles have a certain size, of the order of some tens or hundreds of nanometres. Without that size, you just don't get clear diffraction peaks.
I agree entirely with Mr Bruce Hartley. However I would like to add a few words.
The diffraction peaks, their intensities or peak height are associated with several factors:
1) crystallographic planes;
2) Grain size in powder samples;
3) And amplification and detection system.
However, these heights are associated funmentalmente the intensity of the beam on the sample and not necessarily with dose. And all this obviously depends on the system used and the entire set of slits.
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