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How does a face-centred cubic crystal structure differ from a body-centred cubic structure?

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Diagram of a zinc-lead blast furnace system showing ore and coke entering through charge hoppers, with labeled furnace, air preheater, blower, taphole for slag and lead bullion, and a connected lead-splash condenser using rotors to separate and cool lead and zinc, with pathways for molten metals and off-gas. — metallurgy A zinc-lead blast furnace and lead-splash condenser. This technology is utilized mainly for producing zinc while managing both lead and zinc from raw materials, a technique that was highly influential in 20th-century smelting.

In materials science, the face-centred cubic (fcc) and body-centred cubic (bcc) structures are two fundamental ways atoms are arranged in metallic crystals. They differ primarily in their atomic packing efficiency and the number of nearest neighbors for each atom.12

Face-Centred Cubic (fcc): This structure can be visualized as a cube with atoms located at each of the eight corners and at the center of each of the six faces. It represents a "closest-packed" arrangement where atoms fill 74 percent of the available volume. In an fcc lattice, each atom has 12 nearest neighbors. Metals such as copper, nickel, gold, and silver typically exhibit this structure.12
Body-Centred Cubic (bcc): This structure consists of a cube with atoms at each of the eight corners and a single atom positioned at the very center of the cube. It is less densely packed than the fcc structure, with atoms occupying 68 percent of the volume. In a bcc lattice, each atom has eight nearest neighbors. Examples of metals with this structure include tungsten, chromium, and alpha iron.12