Abstract
In order to investigate the availability of the Pattern Fitting Strucutre Refinement (PFSR) method for phyllo-silicates, the structure of muscovite (2M1 type) by Jackson and West was refined. Enhancement of X-ray intensity by preferred orientation was reduced by the sample treatment with plastic aerosol and further corrected by an orientation function introduced by Rietveld. 49 parameters, including 28 positional ones, were varied with the use of both Gaussian and Lorentzian profile functions. The positional parameters obtained were mostly comparable to those of single crystal study, but some of them, 3 in the Gaussian case and 6 in the Lorentzian, were noticed to differ apparently over 3σ. This was probably due to the inadequacy of profile functions used and the incomplete reduction or correction for preferred orientation.
