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Article Dans Une Revue Physical Review Letters Année : 2011

Diffusionless $\gamma$⇄$\alpha$ phase transition in polycrystalline and single-crystal cerium

Résumé

The cerium $\gamma$⇄$\alpha$ transition was investigated using high-pressure, high-temperature angle-dispersive xray 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
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Dates et versions

hal-00567543 , version 1 (21-02-2011)

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F. Decremps, L. Belhadi, D. L. Farber, K. T. Moore, F. Occelli, et al.. Diffusionless $\gamma$⇄$\alpha$ phase transition in polycrystalline and single-crystal cerium. Physical Review Letters, 2011, 106, pp.065701. ⟨10.1103/PhysRevLett.106.065701⟩. ⟨hal-00567543⟩
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