Dear Javad
Yes
In xrd, x rays always diffracted from different ordered crystallites of the material.
The peaks you get in xrd spectrum, always indicated the ordered planes separately.
You can ask again for further query.
Regards
In XRD Bragg's reflections are from characteristic planes which have typical organizational and orientations order and thereby definite degree of crystallinity.
Hey Javad,
that depends on how well ordered your HEA is and your instruments, but it is generally possible to observe ordering by X-ray diffraction.
If the structure is well ordered on a large scale you will see superstructure reflections (same space group but larger unit cell) or a change in the space group (different but related space group symmetry, Fm-3m turning into Pm-3m for example).
The smaller the ordered domains or the less pronounced the ordering the more difficult it becomes to observe.
In some cases pair distribution function (PDF) analysis will provide further insides
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