STUDY OF STRUCTURAL CHARACTERISTICS OF CATALYSTS BY PLOTTING RADIAL-DISTRIBUTION FUNCTIONS .2. DETERMINATION OF THE MEAN SIZE OF ZONES OF COHERENT SCATTERING FROM RADIAL-DISTRIBUTION FUNCTIONS

A method for simultaneous determination of both the structure and subs tructure of dispersed objects from X-ray scattering data is proposed. In experiment, the intensity is measured at S-equidistant points, whic h permits one to use an effective algorithm for discrete Fourier trans form (DFT) to calculate the radial distribution functions (RDF). On th e basis of the DFT algorithm properties, the maximum distance to be ex amined was estimated. The feasibility of the method was verified exper imentally on model objects. The criteria of selection of the experimen tal conditions and mathematical data treatment are elaborated, dependi ng on the problem to be solved. The method of estimation of average si ze of coherent scattering zones from the RDF is proposed and verified. The model and experimental intensity curves and RDF were compared.