Abstract
Characteristic dynamical diffraction effect on electron diffraction patterns of alloys is discussed based on the multislice method. The dynamical diffraction effect on the scattering amplitude of superlattice reflections of long-range-ordered alloys and the intensity of diffuse scattering of short-range-ordered alloys are represented with the so-called “dynamical factor”. It is shown that the dynamical factor can be estimated as far as alloy composition and basic structure are known without the knowledge of specific ordered atomic arrangements. It is also found that the dynamical factor changes drastically with the increase in the crystal thickness but does not change so much with the reciprocal-lattice vector. Characteristic features of high-resolution electron microscope images and electron diffraction patterns of alloys are discussed with the dynamical factor.
