PPT Slide

37

• The cubic unit cell is the basis of many common crystal lattices.

There are 3 types of cubic unit cells.

1. In simple cubic unit cells, 8 lattice points define the corners of a cube.

• The coordination number of each  particle is 6.

• Atoms touch along cube edges but  not diagonally along its faces or  through its center.

2. A body-centered cubic unit cell has  atom at each corner and 1 in the center.

• Each atom is surrounded by 8 nearest  neighbors; coordination number is 8.

• Atoms at the corners do not touch, but  they all touch the central atom.

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