what is the number of  next nearest or second nearest neighbour in NaCl and CsCl crystal

and what is the method to find it

Asked by Pallavi Chaturvedi | 20th Apr, 2014, 09:59: PM

Expert Answer:

In NaCl structure, each Na+ ion has 12 Na+ ions as the next neighbour.

The NaCl structure can be regarded as two interpenetrating FCC lattices. Each has 6 nearest neighbours of opposite charges, i.e, the co-ordination number is 6 (which is the number of nearest neighbours of an atom in a crystal).

Each Ca+ ion has 6 Cs+ ions as the next nearest neighbour at a distance of r = dCl-Cl-.

The CsCl is an ionic structure showing two interpenetrating simple cubic lattices, one for each kind of ion. It has a coordination number 8. 

Answered by  | 20th Apr, 2014, 11:14: PM

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