The Scherrer equation is used to determine crystallite sizes from XRD spectra. they contain K, a shape factor, that varies from 0.89 for spherical to 0.94 for cubic particles. Usually, this is set to 0.9 for particles of unknown size. Does anyone know where we could find a table with the exact, published values for different crystallites (e.g. monoclinic, cubic, etc.)? Scherrer's original papers are published here http://gdz.sub.uni-goettingen.de/dm...]=scherrer&tx_goobit3_search[squery]=scherrer but a) in German, and b) do not contain such a table. thanks. The discussions in https://www.physicsforums.com/showthread.php?t=122682&page=2 and https://www.physicsforums.com/showthread.php?t=322033 simply assume it's 0.9. No reference is given there. I need the exact table, and a reference.