face-centred cubic structure

(from the article `steel`) ...steel is the allotropy of iron—that is, its existence in two crystalline forms. In the body-centred cubic (bcc) arrangement, there is an ... ...unoccupied. The fourth layer is placed over the first, and so there is a three-layer repetition . . ., which is called the face-centred cubic ... ...close-...
Found on http://www.britannica.com/eb/a-z/f/2
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