DiffusionlessPhase Transition in Polycrystalline and Single-Crystal Cerium
Authors:
- L. BelhadiLBL. Belhadi
- D. L. FarberDFD. L. Farber
- K. T. MooreKMK. T. Moore
- F. OccelliFOF. Occelli
- M. GauthierMGM. Gauthier
- A. PolianAPA. Polian
- D. AntonangeliDAD. Antonangeli
- C. M. Aracne-RuddleCAC. M. Aracne-Ruddle
- B. AmadonBAB. Amadon
- 11 February 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 106 (6) , 065701
Abstract
The cerium $\gamma${}$\rightleftarrows${}$\alpha${} 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.Keywords
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