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In a AB unit cell (Rock salt type) assuming `A^(+)` forming fcc :A. The nearest neighbour of `A^+` is six `B^(-)` ionB. The nearest neighbour of `B^(-)` is six `A^+` ionC. The second neighbour of `A^+` is twelve `A^+`D. The packing fraction of AB crystal is 0.79 |
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Answer» Correct Answer - ABCD Based on FCC crystal, like NaCl lattice Packing fraction`=((4xx4/3pir_(A+)^3)+(4xx4/3pir_(B-)^3))/a^3=((4xx4/3pi a^3/(2sqrt2)^3)+(4xx4/3pi (a^3(0.414)^3)/(2sqrt2)^3))/a^3=0.79` |
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