A binary solid \( \mathrm{A}^{+} \mathrm{B}^{-} \)has a structure with \( \mathrm{B}^{-} \)ions ...
A binary solid \( \mathrm{A}^{+} \mathrm{B}^{-} \)has a structure with \( \mathrm{B}^{-} \)ions constituting the lattice and \( \mathrm{A}^{+} \)ions occupying \( 25 \% \) tetrahedral holes. Formula of the solid is
(1) \( A_{2} B \)
(2) \( \mathrm{AB} \)
(3) \( \mathrm{AB}_{2} \)
(4) \( \mathrm{AB}_{4} \)
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