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Difference between hexagonal close packing and cubic close packing?

Difference between hexagonal close packing and cubic close packing?

Grade:12

1 Answers

RAMESH KUMAR
50 Points
6 years ago
HCP: When tetrahedral voids of the second layer  are  covered by the spheres of the third layer. In this case, the spheres of the third layer are exactly aligned with those of the first layer. Thus, the pattern of spheres is repeated in alternate layers. This pattern is often written as ABAB ....... pattern. This  type of packing is called hexagonal close packing (hcp).
 
CCP: When octahedral voids of the second layer  are  covered by the spheres of the third layer. In this case, the spheres of the third layer are not aligned with those of either the first or the second layer. This arrangement is called CCP type.This pattern of layers is often written as ABCABC ........... This type of packing is called cubic close packing (ccp) or face-centred cubic (fcc) close packing.

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