The corundum crystal structure, found for Al2O3, consists of an

The corundum crystal structure, found for Al2O3, consists of an

The corundum crystal structure, found for Al2O3, consists of an HCP arrangement of O2- ions; the Al3+ ions occupy octahedral positions.
(a) What fraction of the available octahedral positions are filled with Al3+ ions?
(b) Ketch two close-packed O2–planes stacked in an AB sequence, and note octahedral positions that will be filled with the Al3+ ions.

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