A theoretical analysis of the equation of state is performed for the halides of lithium and sodium. The variation of volomo with pressure is calculated using seven different potential functions for the short-range overlap repulsive energy. The van der Waals dipole-dipole and dipole-qnadrupole interactions derived from thevariational method are taken into account. The results obtained are compared with available experimental data. I n most of the crystals studied, the Varshni-Shukla exponential potential for the repulsive energy gives the best agreement with experimental data for the equation of state.Eine theoretische Analyse der Zustandsgleichung wird fur die Lithium-und Natriumhalogenide durchgefuhrt. Die Volumeniinderung unter Druck wird mit sieben unterschiedlichen Potentialfunktionen fur kurzreichweitige repulsive nerlappungsenergien berechnet. Dabei werden van der Waals-Dipol-Dipol-und -Dipol-Quadrupol-Wechselwirkungen berucksichtigt, die mit einer Variationsmethode abgeleitet werden. Die erhaltenen Ergebnisse werden mit vorhandenen experimentellen Werten verglichen. In den meisten der untersuchten Kristalle ergibt das exponentielle Varshni-Shukla-Potential die beste ubereinstimmung mit den experimentellen Daten fur die Zustandsgleichung.
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