[Wien] structure confusion ?

[Zaid]

Than you so much its clear


On Tue, Apr 30, 2013 at 1:27 PM, Rocquefelte <xavier.rocquefelte at cnrs-imn.fr
> wrote:

>  Don't forget that border atoms are shared with other cells !
> Thus for Mg atoms you have:
> - 8 Mg at the corners - each shared between 8 cells -> 8/8 =1 Mg in 1 cell
> - 6 Mg at the center of the faces - each shared by 2 cells -> 6/2 = 3 Mg
> in 1 cell
> - 4 Mg inside the cell
>
> Thus you have 8/8 + 6/2 + 4 = 8 Mg atoms in one cell.
>
> Regards
>
> Xavier
>
>
>
>
> Le 4/30/2013 6:22 AM, Zaid a écrit :
>
> Respected Community
>
> I have a little confusion in understanding the spinel structure. I am
> attaching a perfect MgAl2O4 spinel structure. Why this structure shows more
> than 8 Mg (Yellow in colour) elements ? There should be 8 Mg, 16 Al and 32
> O atoms that adds up to give 56 atoms. I also see more no of atoms in
> Xcrysden.
>
> Best wishes
>  Zaid
>
>
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