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CBSE Class 12 Chemistry Notes: Solid States – Location of Voids in the Crystal

by Anand Meena
April 22, 2019
in 12th Class, Class Notes
Reading Time: 1min read
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LOCATION OF VOIDS IN THE CRYSTAL:-

In a closed packed structure [ccp or hcp] if there are n spheres (atoms or ions) in the packing then
No. of octahedral voids = n
No. of tetrahedral voids = 2n

Example:

In cubic close packing (ccp)
No. of atoms = 4
So No. of octahedral voids = 4
No. of tetrahedral voids = 8

a. Octahedral Voids:-

One octahedral void is present at the body centre of cube and 12 octahedral voids are present on the centres of the 12 edges of the cube. But void on each edge is shared by 4 unit cells so its contribution is = 1/4

b. Tetrahedral Voids:-

There are & tetrahedral voids are present in the ccp structure at different location thus:-
In ccp total no. of voids per unit cell = 8 + 4 = 12
In hcp total no. of voids per unit cell = 12 +6 = 18

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Class 12 Chemistry Solid States All Topic Notes Class 12 Chemistry All Chapters Notes

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Tags: CBSE NotesClass 12 NotesClass 12thFree Notes

Anand Meena

Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics.

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