On the Bonding Energy in Cesium—Graphite Compounds

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Abstract
A model is proposed for the bonding of cesium in the cesium—graphite lamellar compounds. The model assumes that the compounds consist of layers of cesium ions situated between metallike sheets corresponding to the graphitic layer planes. The bonding energy of the cesium to the graphitic layers results from the electrostatic interaction of the cesium ions with the metallike sheets and can be calculated by means of image force theory. An independent value for the bonding energy is also derived from thermodynamic data on the basis of a semiempirical reaction mechanism. This mechanism resolves the heats of formation into three elementary energy parameters; the bonding energy of cesium to the adjacent graphitic layer planes; the energy to separate graphitic layer planes; and the energy of interaction of the cesium ions with neighboring layers of cesium ions. The values of the bonding energy of cesium obtained by the two methods are in good agreement. The energy to separate graphitic layer planes is compared to values obtained in other studies.

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