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 Chemistry crystal structure question?

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varada




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Join date : 2010-06-19

Chemistry crystal structure question? Empty
PostSubject: Chemistry crystal structure question?   Chemistry crystal structure question? Icon_minitimeFri Apr 20, 2012 6:48 am



The crystal structure of MgAl2O4 can be described as a face-centered arrangement of anions (O2-) with Al3+ cations in some of the octahedral holes, and Mg2+ cations in some of the tetrahedral holes.

What fraction of the octahedral holes are occupied by Al3+?
What fraction of the tetrahedral holes are occupied by Mg2+?

Can someone please explain how to determine this? I am very lost Sad

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