Taking into account both attractive and repulsive interactions, derive an equation analogous to Equation (5.2) for the CsCl structure (Figure 1.40). Include the first four terms in the Madelung series. Hint: You may find this easier to do in terms of the cell edge a, and then convert to the interatomic distance d that is normally used in Madelung formulas.

Equation (5.2)

Figure 1.40

Uc (ze) - (Ze) 4neod 6 24 12 8 + 2 3 4 5 SA + -1/2 24 12 6 8