The Scherrer equation, in X-ray diffraction and crystallography, is a formula that relates the size of sub-micrometre particles, or crystallites, in a solid to the broadening of a peak in a diffraction pattern. It is named after Paul Scherrer.[1][2] It is used in the determination of size of particles of crystals in the form of powder.
The shape factor has a typical value of about 0.9, but varies with the actual shape of the crystallite so what about rectangle particles, what should to be?
Please have a look at the reference at page 12 of the link:
https://www.ncl.ac.uk/.../MIT_CrystalSizeAnalysis_SpeakmanS.p...
'JI Langford and AJC Wilson, “Scherrer after sixty years: A survey and some new results in the determination of crystallite size,” J. Appl. Cryst. 11 (1978) p102-113'
https://onlinelibrary.wiley.com/doi/abs/10.1107/S0021889878012844
Numbers from that paper are presented in:
https://www.researchgate.net/post/What_is_Shape_factor_in_Scherrer_formula
and
https://www.researchgate.net/post/How_to_determine_shape_factor_k_in_Scherrer_equation_for_determine_crystal_size
However rectangular particles are not listed; so you should use the numbers assgined to cube shaped one(s).
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