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Questions  

Which of the following is not true about the voids formed in three dimensional hexagonal close packed structure?

a
A tetrahedral void is formed when a sphere of the second layer is present above triangular void in the first layer.
b
All the triangular voids are not covered by the spheres of the second layer.
c
Tetrahedral voids are formed when the triangular voids in the second layer lie above the triangular voids in the first layer and the triangular shapes of these voids do not overlap.
d
Octahedral voids are formed when the triangular voids in the second layer exactly overlap with similar voids in the first layer.

detailed solution

Correct option is C

Tetrahedral voids are formed when the sphere of the second layer lie exactly above the triangular voids in the first layer.Octahedral voids are formed when triangular void of second layer lie above the triangular voids in the first layer but it does not cover the void completely.The triangular shape of there voids are opposite of each other.

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Similar Questions

Match the type of packing given in Column I with the items given in Column II.
 

 Column I Column II
A.Square close packing in two dimensions1.Triangular voids
B.Hexagonal close packing in two dimensions2.Pattern of spheres is repeated in every fourth layer
C.Hexagonal close packing in three dimensions3.Coordination number = 4
D.Cubic close packing in three dimensions4.Pattern of sphere is repeated in alternate layers


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