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In sapphire, oxide ions are arranged in ...

In sapphire, oxide ions are arranged in hexagonal close packing and aluminium ions occupy two-thirds of the octahedral voids. What is the formula of sapphire?

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To find the formula of sapphire, we follow these steps: ### Step 1: Understand the arrangement of ions In sapphire, the oxide ions (O²⁻) are arranged in a hexagonal close packing (HCP). ### Step 2: Determine the number of voids In HCP, the number of octahedral voids is equal to the number of oxide ions (n), and the number of tetrahedral voids is twice the number of oxide ions (2n). ...
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