Class 12 Chemistry The Solid State Centered Unit Cells

Centered Unit Cells

  • If the constituent particles of a crystal lattice are present at positions other than corners in addition to those at corners, it is known as centered unit cell.
  • Centered unit cells are of three types:
    • Body-Centred Unit Cells:

If the constituent particles of a unit cell are present at its body-centre besides the ones that are at its corners.

  • Face-Centred Unit Cells:

If the constituent particles of a unit cell are present at the center of each face, besides the ones that are at its corners.

 

  • End-Centred Unit Cells:

If the constituent particles of a unit cell are present the center of any two opposite faces besides the ones present at its corners.

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