a.u.

[Gad]

In any XRD pattern, the intensity unit considered as [a.u.] which stands for arbitary unit [I guess], can any one tell me what does it mean, I get confused especially with the range of intensity values one material may have, i.e. 0-200 ~0-5000!

is it just an arbitary value or what?

[FirstYearGrad]

If it's in AU then the absolute number doesn't matter, only the value relative to surrounding features.

[kanato]

In XRD the actual measured intensity at each angle depends on how long the detector sat at each position. So it really depends on how long the experimenter decided they wanted to wait for results, which does not tell anything physically meaningful about the material.