October 2009
Intermediate to advanced
503 pages
14h 28m
English
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2.10 NaCl crystal structure
The Bravais lattice of NaCl crystal is a face-centred cube as shown in Fig. 2.16. NaCl is an ionic crystal. It consists of two FCC sub-lattices, one of Cl− ions having origin at (000) and the other of Na+ ion having origin at one half of the body diagonal of the unit cell. The Na+ and Cl− ions are present at equilibrium distances in the crystal. The attractive force between Na+ or Cl− ions in the crystal is balanced by the repulsive forces between them due to same type of charges. In this crystal, either Na+ or Cl− ions could occupy the corner and face-centre positions with the ions of the opposite type occupying the alternate positions in between them. Each ion is surrounded by six other type ions so that the co-ordination ...
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