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Summary
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In ionic solids, anions typically form the base lattice.
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Interstices can be completely or partially filled depending on the size of cations and stoichiometry.
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Pauling’s rules play an important role in structure determination and deviations lead to structural distortions.
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Most ceramic compounds follow three types of common structures based on packing of anions i.e.
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Structures based on FCC packing of anions
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Structures based on HCP packing of anions
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Primitive cubic or other structures
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