title: Diffusionless γ⇄α phase transition in polycrystalline and single-crystal cerium.
abstract: The cerium γ⇄α transition was investigated using high-pressure, high-temperature angle-dispersive x-ray diffraction measurements on both poly- and single-crystalline samples, explicitly addressing symmetry change and transformation paths. The isomorphic hypothesis of the transition is confirmed, with a transition line ending at a solid-solid critical point. The critical exponent is determined, showing a universal behavior that can be pictured as a liquid-gas transition. We further report an isomorphic transition between two single crystals (with more than 14% of volume difference), an unparalleled observation in solid-state matter interpreted in terms of dislocation-induced diffusionless first-order phase transformation.
authors.affiliation: IMPMC, Université Pierre et Marie Curie, 75252 Paris, France.
authors.forename: F
authors.initials: F
authors.lastname: Decremps
authors.forename: L
authors.initials: L
authors.lastname: Belhadi
authors.forename: D L
authors.initials: DL
authors.lastname: Farber
authors.forename: K T
authors.initials: KT
authors.lastname: Moore
authors.forename: F
authors.initials: F
authors.lastname: Occelli
authors.forename: M
authors.initials: M
authors.lastname: Gauthier
authors.forename: A
authors.initials: A
authors.lastname: Polian
authors.forename: D
authors.initials: D
authors.lastname: Antonangeli
authors.forename: C M
authors.initials: CM
authors.lastname: Aracne-Ruddle
authors.forename: B
authors.initials: B
authors.lastname: Amadon