Abstract
An efficient real space method is derived for the evaluation of the Madelung's potential of ionic crystals. The proposed method is an extension of Evjen's method. It takes advantage of a general analysis of the potential convergence in real space. Indeed, we show that the series convergence is exponential as a function of the number of canceled multipolar moments in the unit cell. The method proposed in this work reaches such an exponential convergence rate. Its efficiency is comparable to Ewald's method. However, unlike the latter, it uses only simple algebraic functions.
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