So in the end when someone is selling you a spinning attachment for a Bragg-Brentano instrument because it help reducing texture effects, it is a lie
The main reason to spin a sample is to improve particle counting statistics, so that the intensities are not dominated by a small number of crystallites. This may not be needed when powders are finely ground and are not too highly absorbing, but it never hurts. Spinning can also simplify texture treatment, by reducing the potential anisotropy from three axes to two.
Brian
