Abstract
The quantitative evaluation of the constituents of mixtures from x-ray powder diffraction patterns has been highly successful in certain cases, but has been found subjected to limitations as an analytical tool of more general use. These arise from a number of effects which interfere with a simple interpretation of the patterns. The paper discusses the basic aspects of these interferences, in particular of those which result from superpositions of lines, and develops a method which takes account of them. The method is adapted to meet such cases where the constituents or impurities which interfere with the regular patterns are unknown.

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