The question is somewhat confusing. Which angle do you mean? Clearly the theta angle is not fixed... If you are asking about wether to use wide angle or small angle xrd, this depends on the distance between the objects in your material that you want to study. If its atoms, wide angle is good, if its particles, crystallites, lamellae, micelles impurities, small angle is good.
The question is somewhat confusing. Which angle do you mean? Clearly the theta angle is not fixed... If you are asking about wether to use wide angle or small angle xrd, this depends on the distance between the objects in your material that you want to study. If its atoms, wide angle is good, if its particles, crystallites, lamellae, micelles impurities, small angle is good.
Depending the material of the crystals grown, the angle theta can be fixed.
Once more, I note that the value (range) of diffraction angle is meaningless if the wavelength is not quoted. Please also note that if your sample consists of only one or few individuals of growing crystals, one cannot collect a XRD powder spectrum (unless the sample is rotated around two directions: Gandolfi camera or similar one).
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