title: Mechanism of the body-centered cubic--hexagonal close-packed phase transition in iron.
abstract: The transition from body-centered cubic to hexagonal close-packed phase in iron has been studied in a diamond anvil cell with synchrotron radiation. The hexagonal close-packed phase, when it first appears, has a ratio of lattice parameters that is significantly larger than normal. This is attributed to a displacive mechanism that causes a distortion of the hexagonal close-packed structure in a body-centered cubic matrix. The hexagonal close-packed phase adjacent to a boundary with the body-centered cubic phase is stretched in the c direction and compressed in the a direction when it first forms.
authors.forename: W A
authors.initials: WA
authors.lastname: Bassett
authors.forename: E
authors.initials: E
authors.lastname: Huang