Can the crystallite size only be determined when it is smaller than 100nm using XRD, (Scherrer equation or software)?

i have standard corundum sample (Al2O3).  i  try to calculate peak at position 35.14 degree using TOPAS, EVA and Sharrer Equation, what i got : From scherrer equation , crystallite size :...

08 April 2015 8,288 15 View