Why is it not possible for a salt with the formula $\mathrm{M}_{3} \mathrm{X}\left(\mathrm{Na}_{3} \mathrm{PO}_{4}, \text { for example }\right)$ to have a facecentered cubic lattice of X anions with M cations in octahedral holes?
Added by Jeremy C.
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Step 1: In a face-centered cubic lattice, each corner of the cube is occupied by an X anion, and there is an additional X anion at the center of each face of the cube. Show more…
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