2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17581We perform a high-temperature expansion of the grand potential of the restrictive primitive model of electrolytes in the frame of the extended sine-Gordon theory exposed in the companion paper. We recover a result already obtained by Stell an Lebowitz (J. Chem. Phys., 49, 3706 (1968)) by means of diagrammatic expansions.Statistical Mechanicstext