Atomic Packing Factor of FCC & HCP
Автор: Engineering with Rajnish
Загружено: 2019-12-21
Просмотров: 44759
Описание:
Simple hexagonal contains one lattice point at each corner of hexagonal face & one at the center hexagonal faces .So effective number of atoms is 3.
In hexagonal closed packed structure there are three atoms at the interstices between two hexagonal faces. The total number of atoms within the unit cell is 6 and coordination number is 12.
A.P.F of HCP is equal to 0.74 same as for FCC which is the most efficient packing of equal sized sphere or atoms.
The difference between two structures lies in the stacking sequence. The ABCABC..... packing sequence of the FCC structure and ABABA packing sequence of the HCP structure.
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