Lesson 2, Topic 9
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Hexagonal Close Packing

Abdulaziz July 26, 2020
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Another View of hcp Structure

Another view of HCP

  • Examples of HCP metals: Mg, Ti, Zn, Be, Co, Zr, Cd.

Hexagonal System-Number of atoms

  • Hexagonal lattices must be specified by base side length a and height c.

What is the number of atoms per cell ?

Number of atoms per unit cell = 3. Try it now!

  • The corner atom shared ? with neighboring cells. (Total 12 × 1/6 = 2 )
  • The centered atom at the top and bottom of the cell shared is 2 with neighboring cell. (Total: 2 ×1/2 = 1)
  • There are 3 atoms inside the unit cell.