Question

3.42 Tetrahedral and octahedral holes are formed by the vacancies left when anions pack in a ccp array. (a) Which hole can accommodate the larger ions? (b) What is the radius ratio of the largest metal cation that can occupy an octahedral hole to the largest that can occupy a tetrahedral hole while maintaining the close-packed nature of the anion lattice? (c) If half the tetrahedral holes are occupied, what is the empirical formula of the compound MxAy, where M represents the cations and A the anions?

          3.42 Tetrahedral and octahedral holes are formed by the
vacancies left when anions pack in a ccp array. (a) Which hole can
accommodate the larger ions? (b) What is the radius ratio of the
largest metal cation that can occupy an octahedral hole to the
largest that can occupy a tetrahedral hole while maintaining the
close-packed nature of the anion lattice? (c) If half the
tetrahedral holes are occupied, what is the empirical formula of
the compound MxAy, where M represents the cations and A the
anions?

Added by Samuel G.

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