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short communications
In order to accommodate anisotropic crystallite-size broadening effects in the Rietveld refinement of constant-wavelength powder neutron diffraction data, a modified function for the peak full width at half maximum has been evaluated for polycrystalline Ni(OD)2. The function resulted in significantly better agreement between observed and calculated profiles (the weighted residual Rw.p decreased from 14.1 to 8.5%), and structural standard deviations were reduced by an average of 43%.