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The Solid State
Close Packed Structures – Voids
2 questions from 2 papers, each with its answer.
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Appears in
Concepts tested
- formula from fraction of octahedral voids occupied
- voids in hexagonal close packing
All Questions
2021 1 question
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Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:Number of atoms in a hexagonal primitive (hcp) unit cell = 6 Number of tetrahedral voids = 2 × number of atoms = 12 Number of octahedral voids = number of atoms = 6
2019 1 question
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A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:Anions (A) form hcp, so number of anions per unit cell $=6$, and number of octahedral voids $=6$. Cations (C) occupy 75% of octahedral voids: number of cations $=6\times\frac{3}{4}=\frac{18}{4}=\frac{9}{2}$ Formula: $C_{9/2}A_6\Rightarrow C_9A_{12}\Rightarrow C_3A_4$