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In corundum, oxide ions are arranged in ...

In corundum, oxide ions are arranged in hexagonal close packing and aluminium ionsa occpy tow-third of the octaheral voids. What is the formula of corrundum ? .

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Number of oxides per unit cell = 6
Number of octahedral voids per unit cell = 6
Number of `Al^(+3)` ions in octahedral voids `= (6xx2)/(3)=4`
`therefore Al^(+3):O^(-2)`
4 : 6 or 2 : 3
Hence, formula is `Al_(2)O_(3)`.
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