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This analysis details the calculation of effective atoms in a hexagonal close-packed (HCP) unit cell. The formula used accounts for the contributions from corner and face-centered atoms. The results show that the total effective atoms is 6, derived from the sum of contributions from each type of atom within the cell. Additionally, the volume occupied by the atoms and the percentage occupancy is calculated at 74%. This information is crucial for understanding the structure and properties of materials with HCP crystallography.
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HCP RATIO 2r B B B 2r B B 2r B L=2r
Volume of unit cell No of effective atoms : 12x1/6 +2x1/2+3=2+1+3=6 Volume of atoms: Percentage occupancy of atoms in the HCP cell: =25.132/33.94x100%=74%