Madelung constants of both simple and complex salts can be reduced to a common scale by taking the nearest‐neighbor distance as the unit distance and then dividing by half the sum of the squares of the charges of all the atoms in the stoichiometric unit. These ``reduced Madelung constants,'' α, can be predicted within a few percent by the relation α=1.89—1/m, where m is the harmonic mean coordination number. Madelung constants have been calculated for LaOCl, YOF, ReO3, and several perovskite structures for comparison with the predictions.

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A negative sign has been introduced because now za is taken as negative.
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Note added February 15, 1955: From the data of
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)) one can derive αm = 1.66 compared with α(predicted) = 1.60 for Fe+++Cu+O2.
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