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The third common crystal structure in metals can be visualized as an assembly of cubes with atoms at the corners and an atom in the centre of each cube; this is known as body-centred cubic, or bcc.
Crystal arrangements are important in the behaviour of the transition metals and occur in the close-packed fcc, bcc, or hcp arrangements.
It is significant that the sides of the face-centred cube, or the distances between neighbouring lattices in the fcc arrangement, are about 25 percent larger than in the bcc arrangement; this means that there is more space in the fcc than in the bcc structure to keep foreign (i.e., alloying) atoms in solid solution.
Like iron, the metal can exist in two crystalline forms: hexagonal close-packed (hcp) below 883 °C (1,621 °F) and body-centred cubic (bcc) at higher temperatures up to its melting point.
Europium metal, which has a bcc structure, oxidizes the most rapidly of any of the rare earths with moist air and needs to be handled at all times in an inert gas atmosphere.
Tungsten exhibits a body-centred cubic (bcc) crystal lattice.
An international team of geophysicists led by Leonid Dubrovinsky of Bayerisches Geoinstitute, University of Bayreuth, Ger., reported new evidence that the crystalline structure of Earth's solid inner core is body-centred cubic (bcc) as opposed to hexagonal close-packed (hcp).
Gamma uranium has a body-centred cubic (bcc) crystal structure, while beta uranium has a tetragonal structure.
Its crystal structure is either body-centred cubic (bcc) or face-centred cubic (fcc), depending on the temperature.
At room temperature, pure iron has a bcc structure referred to as alpha-ferrite; this persists until the temperature is raised to 912° C (1,674° F), when it transforms into an fcc arrangement known as austenite.
