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Voids

In which of t...

Question

In which of the following arrangements octahedral voids are formed ?

(a) hcp (b) bcc (c) simple cubic (d) fcc

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Solution

Answers: (a), and (d)

In hcp and fcc arrangement octahedral voids are formed. in fcc, the octahedral voids are observed at edge and center of the cube while in bcc and simple cubic, no any octahedral voids are observed.

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Q. In which of the following arrangements octahedral voids are formed?
(i) hcp
(ii) bcc
(iii) simple cubic
(iv) fcc

The correct order of the packing efficiency in different types of nuit cells is ............

(a) fcc < bcc < simple cubic (b) fcc > bcc > simple cubic

(c) fcc < bcc > simple cubic (d) fcc < bcc > simple cubic

Statement: Tetrahedral voids and octahedral voids, both are found is hcp and simple cubic structure.

State whether the given statement is true or false.

Q. In which of the following arrangements octahedral voids are formed?

Q. There are three cubic unit cells

A, B

C

A

F C C

and all of its tetrahedral voids are also occupied.

B

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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