In the case of ceramics particle size and grain size can, frequently, be equivalent and have been and are used ambivalently. Ceramic materials are, in fact, fragile and when crushed, tend to break up along the grain boundaries. read more
Thank you Dr. Nabeel for this question. Grain Size and Crystalline size are the same. Particle size is related to the size of many grains or crystals combined in one particle. read more
XRD analysis usually indicate each particle is an agglomerate composed of smaller crystallites (average crystallite size = X) or whether each particle is a single crystallite. so there is no difference between crystallite and grain size. read more