2. Crystal Structure
2. Crystal Structure
2. Crystal Structure
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HCPcoordination number = 12total 4 atoms per unit cell4 R√2 a = 4 R a = ——√2APF = 0.74the closest packing possible of sphericalatoms cubic closest-packedcoordination number = 12total 2 atoms per unit cellAPF = 0.74the closest packing possible of sphericalatomsc/a ratio for ideal HCP structure is 1.6336