The al2o3 crystal structure (corundum) consists of an hcp arrangement of o2- ions; the al3+ ions occupy octahedral positions. what fraction of the available octahedral positions are filled with al3+ ions? in corundum, the al3+ ions do not fill the tetrahedral positions.

The fraction of the available octahedral positions are filled with ions is

Explanation:

If there are n numbers of spheres in HCP in packing:

Number of octahedral void = n

Number of tetrahedral void = 2n

Total number of voids = n + 2n = 3n

The crystal structure consists of an HCP arrangement of ions.

Number of spheres in HCP = 6

Number of = 6

Number of octahedral voids = 6

Number of tetrahedral void = 12

Number of aluminum ions when there are 6 ion =

Number of voids in which ions are present = 4

The fraction of the available octahedral positions are filled with ions =

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elements make up everything, and they combine to make compounds.

the answer is c