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Crystal System and Bravais Lattice

If unit cell ...

Question

If unit cell of a substance is face centred cubic unit cell then is it necessary that the structure will be tetrahedral? Is their any other possibility? What about body centred?

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Solution

The structure of FCC molecules can be tetrahedral or octahedral based upon the octahedral or tetrahedral holes. The structure of BCC unit is cell octahedral.

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