Question

what are voids ? define octahedral void and tetrahedral void.​

Answer 1

Answer:

Tetrahedral voids are unoccupied empty spaces present in substances having a tetrahedral crystal system. Octahedral voids are unoccupied empty spaces present in substances having an octahedral crystal system. It can be found in substances having a tetrahedral arrangement in their crystal system.

Explanation:

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Answer 2

The vacant space in close packed arrangement is called voids.

Tetrahedral void: A void surrounded by four spheres in tetrahedral position is called tetrahedral void. In a close packed arrangement the number of tetrahedral voids is double the number of spheres, i.e. there are two tetrahedral voids per sphere.
Octahedral voids: A void surrounded by six spheres in octahedral position is called octahedral void. In a close packed arrangement the number of octahedral voids is equal to the number of spheres, i.e. there is only one octahedral void per sphere.
If there are N close packed spheres, The number of tetrahedral voids = 2N and The number of octahedral voids = N.

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