Question

Difference between hexagonal and hexagonal close packed structure​

Answer 1

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The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. ... The simple cubic has a coordination number of 6 and contains 1 atom per unit cell.

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Answer 2

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• The hexagonal and cubic close packed lattices have two types of holes: tetrahedral and octahedral.

• A tetrahedral hole is the empty space surrounded by four neighboring atoms located at the corner of a tetrahedron ( ).