Class 12 Chemistry The Solid State Locating Tetrahedral Voids

Locating Tetrahedral Voids

  • Take a unit cell of ccp or fcc lattice divide into eight small cubes with each small cube having atoms at alternate corners.
  • Thus, each small cube has 4 atoms that on joining to each other make a regular tetrahedron.
  • Thus, there is one tetrahedral void in each small cube and eight tetrahedral voids in total.
  • Each of the eight small cubes have one void in one unit cell of ccp
  • ccp structure has 4 atoms per unit cell. Thus, the number of tetrahedral voids is twice the number of atoms.

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