1980 Volume 37 Issue 8 Pages 555-561
X-ray line broadening of doubly-oriented poly (vinyl alcohol) films, obtained by rolling and annealing, was measured to investigate the effects of crystal size and lattice distortion. The 200 line profile assumed a shape intermediate of Cauchy and Gaussian in the vicinity of the peak, and was approximated by a Cauchy distribution at the tails. Integral line breadths of 100, 200, and 400 showed that the lattice distortion was rather of microstrain type than of paracrystalline type. In evaluating the effects of crystal size and lattice distortion, especially in the case where only two different orders of diffraction were observed, it was concluded that more satisfactory results were obtained with the assumption that the broadening due to the crystal size was Cauchy, while the broadening due to the lattice distortion was Gaussian, than with the assumptions that both broadenings due to the size and the distortion were Cauchy or Gaussian. This conclusion was consistent with the shape of X-ray line profiles.
