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
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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