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A methodology for calculating the contribution of charged defects to theconfigurational free energy of an ionic crystal is introduced. Thetemperature-independent Wang-Landau Monte Carlo technique is applied to asimple model of a solid electrolyte, consisting of charged positive andnegative defects on a lattice. The electrostatic energy is computed on latticeswith periodic boundary conditions, and used to calculate the density of statesand statistical-thermodynamic potentials of this system. The free energy as afunction of defect concentration and temperature is accurately described by aregular solution model up to concentrations of 10% of defects, well beyond therange described by the ideal solution theory.  The approach, supplemented by short-ranged terms in the energy, is proposedas an alternative to free-energy methods that require a number of simulationsto be carried out over a range of temperatures.

New Methods for Calculating the Free Energy of Charged Defects in Solid Electrolytes