Abstract
AbstractThe contribution of anion polarization to the lattice energy of inorganic compounds with layer‐ and chain‐lattice structure is calculated using an extension of the simple ionic model. This consists of assigning to the anions ideal dipoles, the direction of which is deduced from the structure. With the aid of a theorem due to de Wette the polarization energy per anion is expressed in terms of the form containing the polarizability and diameter of the anion and two geometric constants representative of the ionic and the dipole field at the anion site. I and D depend on the crystal structure in an analogous way to the Madelung constant. By combination of polarization energy, Coulomb energy and Born repulsion energy, formulae for the lattice energy are obtained. They allow a quantitative representation of some trends in crystal chemistry and a rather close approximation to the thermodynamic lattice energy of real compounds.
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