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The face centered cubic (FCC) structure has atoms located at each of the corners and the centers of all the cubic faces. Each of the corner atoms is the corner of another cube so the corner atoms are shared among eight unit cells. Additionally, each of its six face centered atoms is shared with an adjacent atom. The body-centered cubic (BCC) structure, on the other hand, has atoms at each of the eight corners of a cube plus one atom in the body center of the cube. Each of the corner atoms is the corner of another cube so the corner atoms are shared among eight unit cells. Like the FCC lattice, here too the corner atoms are in contact with the (body) central atom and in limiting cases, in contact with each other.
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