How many atoms will in contact with one of the body diagonal plane?
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A type of atoms are at 8 corners, B type of atoms are at 6 face centres, C type of atoms occupy all tetrahedral voids and D type atoms occupy all octahedral voids.
Here, A and B together make a FCC(or CCP) unit cell structure.
Each Corner and face-centered atom contribute 1/8 and 1/2 respectively towards one unit cell.
For one FCC unit cell, there are total 8 tetrahedral voids (2 along each body diagonal at 1/4 from eah corners,, all completely inside FCC unit cell so each contribute complete 1).
For one FCC unit cell, there are total 4 octahedral voids (12 along each edge centre which contribute 1/3 each towards one unit cell and one complete octahedral void at the body centre of FCC).
Here, A and B together make a FCC(or CCP) unit cell structure.
Each Corner and face-centered atom contribute 1/8 and 1/2 respectively towards one unit cell.
For one FCC unit cell, there are total 8 tetrahedral voids (2 along each body diagonal at 1/4 from eah corners,, all completely inside FCC unit cell so each contribute complete 1).
For one FCC unit cell, there are total 4 octahedral voids (12 along each edge centre which contribute 1/3 each towards one unit cell and one complete octahedral void at the body centre of FCC).
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