Third layer of spheres is added to second
layer so as to form bcp or ccp structure
What is the difference between addition of
third layer to form these hexagonal close packed
structure?
Answers
Answer:
Third layer of spheres is added to second
layer so as to form bcp or ccp structure
What is the difference between addition of
third layer to form these hexagonal close packed
structure is trigonal.
Answer:
(1) In the formation of hexagonal closed-packed (hep) structure, the first one dimensional row shows depressions between neighbouring atoms.
(2) When a second row is arranged so that spheres fit in these depressions then a staggered arrangement is obtained. If the first row is A then the second row B.
(3) When third row is placed in staggered manner in contact with second row then A type arrangement is obtained.
4)Similarly, the spheres in fourth row can be arranged as B type layer. This results in ABAB.. ype setting of the layers. This gives hexagonal close packing (hcp) structure.