Sun July 29, 2012 By:

In the normal spinel structure, the oxide ions are arranged in CCP pattern. The Zn2+ ions occupy one eighth of the tetrahedral holes and one half of the octahedral voids are occupied by Al3+. Give the formula of the spinel.

Expert Reply
Wed August 01, 2012

Since Zn2+ atoms occupy one-eighth of all the tetrahedral voids and the Al3+ atoms occupy half of all the octahedral voids in the oxygen lattice.  Thus the formula becomes "ZnAl2O4"

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