PPT Slide

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3. The face-centered cubic unit cell has an atom at each corner and in the center of each face in all directions.

• The coordination number is 12.

• Atoms at the corners touch those in the faces, but not other corner atoms.

• Unit cells build up the crystal lattice.  Atoms on a lattice point are shared  by adjacent unit cells.

• Since there are eight corners in a cube,  each simple cubic cell contains:  8 x 1 ¼ 8 atom = 1 atom.

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