The packing efficiency is about 74%. This is the maximum packing efficiency for spheres of equal radius and is call closest packing. Thus a face centered lattice of atoms is also called Cubic Closest Packing (CCP).
| Introduction |
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| In
the Face Centered Cubic (FCC) unit cell there is one host atom at
each corner and one host atom in each face. Since each corner atom
contributes one eighth of its volume to the cell interior, and each face
atom contributes one half of its volume to the cell interior (and there
are six faces), then Z = 1/8.8
+ 1/2.6 = 4.
The packing efficiency is about 74%. This is the maximum packing efficiency for spheres of equal radius and is call closest packing. Thus a face centered lattice of atoms is also called Cubic Closest Packing (CCP). |
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