central potential function is used to calculate the elastic constants through fourth order. It is assumed that the vibrational contribution to the free energy of a solid is given by Fvib = kT ln2sinh { ~ 2" l ; } and from this, the temperature dependence of the third 3 S N i = l order elastic constants are calculated. These data are then used to calculate the equation of state of copper, silver, aluminum, and nickel. Agreement between experimental and theoretical equations of state is quite good for pressures as high as 400 kbar.Eine zentralsymmetrische Potentialfunktion wird zur Berechnung der elastischen Konstanten bis zur vierten Ordnung benutzt. Es wird angenommen, daB der Schwingungsanteil zur freien Energie eines Festkorpers durch F v i b = kT 2 In 2 sinh ~ gegeben ist. Hieraus wird die Temperaturabhiingigkeit der elastischen Konstanten dritter Ordnung berechnet. Die Daten werden dann benutzt, um die Zustandsgleichungen fur Kupfer, Silber, Aluminium und Nickel zu berechnen. Die Vbereinstimmung zwischen der experimentellen und der theoretischen Zustandsgleichung ist fur Drucke bis zu 400 kbar ziemlich gut.
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