Which of the following statement is not true about the voids?

Octahedral void is formed at the center of six spheres which lie at the apices of a regular octahedron.

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There is one octahedral site for each sphere.

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There are two tetrahedral sites for each sphere.

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Octahedral voids are formed when the triangular voids in second layer exactly overlap with similar voids in the layer.

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Solution

The correct option is D Octahedral voids are formed when the triangular voids in second layer exactly overlap with similar voids in the layer.
Octahedral voids are formed when three closed packed spheres forming an equilateral triangle, are put over another set of three spheres, but in opposite direction.

So, in the given options, option D is wrong.

Hence, Option "D" is the correct answer.

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Similar questions

Which of the following is not true about the voids formed in 3 dimensional hexagonal close packed structure ?

(a) A tetrehedral 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 triangulare shapes of these voids do not overlap

(d) Octahedral voids are formed when the triagular voids in th second layer exactly overlap with similar voids in the first layer

Q. Assertion :A tetrahedral void is surrounded by four spheres and an octahedral void is surrounded by six spheres. Reason: The number of tetrahedral voids is double the number of close packed spheres and number of octahedral voids is equal to number of close packed spheres.

Q. How many tetrahedral and octahedral void spaces are three for each sphere in close packing?

Which of the following statement is not true about the hexagonal close packing ?

(a) The coordination number is 12

(b) It has 74% packing efficiency

(d) In this arrangement spheres of the fourth layer are exactly aligned with those of the first layer

Q. There are three cubic unit cells

A, B

and

C

A

F C C

and all of its tetrahedral voids are also occupied.

B

is also

F C C

and all of its octahedral voids are also occupied.

C

is simple cubic and all of its cubic voids are also occupied. If voids in all unit cells are occupied by the spheres exactly at their limiting radius, the order of packing efficiency would be:

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