Thu February 21, 2008 By:


Expert Reply
Thu February 21, 2008

1. If n Oxide ions  form the close packing----nO,

There will be 2n tetrhehral void, as 1/6 are occupied by A----2nX1/6 = n/3B

There will be n octahedral voids 1/3 are occupied by B---nX1/3 = n/3B

Ratio of A:B;O = n/3A : n/3B : nO

formulas are written in whole number multiply by 3.

A : B : 3O

 the formula is ABO3

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