Chapter 12: Problem 27
Consider an ionic solid MX with \(\mathrm{NaCl}\) structure. Construct a new structure \((\mathbf{Z})\) whose unit cell is constructed from the unit cell of MX following the sequential instructions given below. Neglect the charge balance. (i) Remove all the anions \((\mathbf{X})\) except the central one (ii) Replace all the face centered cations ( \(\mathbf{M}\) ) by anions \((\mathbf{X})\) (iii) Remove all the corner cations \((\mathbf{M})\) (iv) Replace the central anion \((\mathbf{X})\) with cation \((\mathbf{M})\) The value of \(\left(\frac{\text { number of anions }}{\text { number of cations }}\right)\) in \(\mathbf{Z}\) is
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