[GSAS-II] Size and Mustrain calculation in GSAS-II

[kasa belachew]

 Dear all GSAS-II experts

I am trying to calculate crystallite size and Microstrain for
Lead Oxide(PbO). As you Know ; GSAS-II computes the crystallite sizes ( 10-6
m) in three different (isotropic, uniaxial and ellipsoidal) Microstrain in
terms of the amount of lattice spread, unitless fraction of Δd/d (or
equivalently ΔQ/Q) times 106 (isotropic, uniaxial and generalized)
arrangement. Below is my refinement result. The average size is very large
and there is no microstrain like this.
 Is there anyone who can clarify this problem please?

       Average size  10-6m                         Average Microstrain ( 106
m)
Isotropic      Uniaxial       Ellipsoidal      Isotropic      Uniaxial
Generalized
   0.01           1.541           0.926               2231          8800
          7489
I am waiting for your best answer
Thanks!
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