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In BeO (zinc blende structure), Mg^(2+) ...

In `BeO` (zinc blende structure), `Mg^(2+)` is introduced in available `TV` is. The coordination numbers of `Be^(2+)` and `Mg^(2+)` are, respectively,

A

`8,8`

B

`6,6`

C

`4,4`

D

`8,6`

Text Solution

Verified by Experts

The correct Answer is:
C
In `ZnS`- type structure, anions from fcc and cations are present in alternate `TVs`
In `BeO`, Number of `O^(2-) =` Corner `+` Face centre
`= 1 + 3 = 4`
Number of `Be^(2+) = 4` (alternate TVs)
Number of `Mg^(2+)` introduced `= 4` (available `TV = 4`)
So `CN` of `Be^(2+)` and `Mg^(2+)` ion `= 4:4`
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