Abstract
Abstract It is emphasized, that the loss of long range order does not necessarily destroy three-dimensional lattices. Nematic or smectic mesophases as well as special types of liquid crystals, many crystalline or amorphous high polymers, crystals near the melting point, molten substances and mixed crystals are examples in nature. The theory of paracrystals describes such lattices quantitatively in a most convenient mathematical way. A very short survey of the main formulas is given, which are needed for a practical application of the theory to X-ray, electron and neutron diffraction problems. The derivations are given in standard texts.1,2 This publication is confined to the discussion of the integral widths of the reflections. Two reasons for line broadening are discussed: paracrystalline distortions and particle size effects. It will be shown how one can separate these two effects and also the effect of thermal oscillations. These results are applied in a separate section to the analysis of paracrystall...
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