Question: Hcp structure show that the c/a ratio for an ideal hexagonal close-packed structure is (8/3) 1/2 = 1.633. If c/a is significantly larger than this

Hcp structure show that the c/a ratio for an ideal hexagonal close-packed structure is (8/3)^1/2 = 1.633. If c/a is significantly larger than this value, the crystal structure may be thought of as composed of planes of closely packed atoms, the planes being loosely stacked.

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