Surfaces and Molten Ionic Compounds

This is presumably the smallest electrostatic surface energy, which explains why the (100) surfaces arc the natural cleavage and growth planes. Seitz (1940, p. 97) discusses corrections due to the overlap interaction and indicates that they are surprisingly large. 

The liquid state of ionic compounds seems also to be rather simply analyzed. The change from crystal to liquid is much less dramatic in ionic solids than in covalent solids, since the ionic crystal is already close-packed. The liquid is presumably a somewhat random, but locally neutral, conglomeration of ions. Most of the studies of ionic compounds made in this part of the book have not depended greatly on details of structure and so remain appropriate in the liquid. It should be noted, however, that for studies of transport and diffusion, one should 

A diffusing ion transports 7. electron charges, even though at various stages of its motion we may think of it as having an effective charge Z = Z — 

Use atomic term values from the Solid antifluoriic systems listed in Table 14-3. 

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