Where are the tetrahedral voids and octahedral voids located in an FCC?

Asked Sep 24 '20 at 06:43

Active Sep 24 '20 at 06:43

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A crystal is made up of atoms X, Y, and Z. Atoms X are in FCC packing, Y occupy all octahedral voids and Z occupies all the tetrahedral voids. If all the atoms along two body diagonal are removed, find formula of crystal.

Since there are 4 atoms in FCC, number of X=4. Tetrahedral voids occupy twice the number of atoms and octahedral voids occupy half of tetrahedral, so Y=4, and Z=8.

Now how I do proceed from here? I do not know where these voids are located.

asked Sep 24 '20 at 06:43

Roshan

Have you tried searching on google for the structure of an FCC and its voids? – Safdar Faisal Sep 24 '20 at 06:44
@Safdar I have but various sources are having various answers so I couldn't confirm – Roshan Sep 24 '20 at 06:45
@Safdar thankyou very much, this gives a perfect explanation. I was wondering if there is a post for the same concept done for CCP or HCP? – Roshan Sep 24 '20 at 07:30
https://chemistry.stackexchange.com/questions/102248/number-of-octahedral-and-tetrahedral-voids-present-in-a-hcp-structure?rq=1 – Safdar Faisal Sep 24 '20 at 07:44
CCP and FCC are same.. – Safdar Faisal Sep 24 '20 at 07:44

Where are the tetrahedral voids and octahedral voids located in an FCC?

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