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...steel is the allotropy of iron—that is, its existence in two crystalline forms. In the body-centred cubic (bcc) arrangement, there is an additional iron atom in the centre of each cube. In the face-centred cubic (fcc) arrangement, there is one additional iron atom at the centre of each of the six faces of the unit cube. It is significant that the sides of the face-centred cube, or the...
in crystal: Structures of metals )...unoccupied. The fourth layer is placed over the first, and so there is a three-layer repetition ABCABCABC . . ., which is called the face-centred cubic (fcc), or cubic-closest-packed, lattice. Copper, silver (Ag), and gold (Au) crystallize in fcc lattices. In the hcp and the fcc structures the spheres fill 74 percent of the...
...close-packed, or hcp); the other would lead to a crystal with cubic symmetry that could also be visualized as an assembly of cubes with atoms at the corners and at the centre of each face (known as face-centred cubic, or fcc). Examples of metals with the hcp type of structure are magnesium, cadmium, zinc, and alpha titanium. Metals with the fcc structure include aluminum, copper, nickel, gamma...
Crystal-structuresFigure 3: Crystal structures. There is an equal number of the two types of ions in the unit …[Credits : Encyclopædia Britannica, Inc.]
The-commonest-metallic-crystal-structuresThe commonest metallic crystal structures.[Credits : Encyclopædia Britannica, Inc.]
Unit-cells-for-face-centred-and-body-centred-cubic-latticesFigure 1: Unit cells for face-centred and body-centred cubic lattices.[Credits : Encyclopædia Britannica, Inc.]
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