Diffusionless γ⇆α Phase Transition in Polycrystalline and Single-Crystal Cerium

被引：57

作者：

Decremps, F. ^{[1
]}

Belhadi, L. ^{[1
]}

Farber, D. L. ^{[2
]}

Moore, K. T. ^{[2
]}

Occelli, F. ^{[3
]}

Gauthier, M. ^{[1
]}

Polian, A. ^{[1
]}

Antonangeli, D. ^{[1
]}

Aracne-Ruddle, C. M. ^{[2
]}

Amadon, B. ^{[3
]}

机构：

[1] Univ Paris 06, IMPMC, F-75252 Paris, France

[2] LLNL, Livermore, CA 94550 USA

[3] CEA, DAM, DIF, F-91297 Arpajon, France

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 06期

关键词：

VOLUME COLLAPSE; MOTT TRANSITION; POINT;

D O I：

10.1103/PhysRevLett.106.065701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The cerium gamma reversible arrow 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.

引用

页数：4

共 28 条

[1] KONDO VOLUME COLLAPSE AND THE GAMMA-]ALPHA TRANSITION IN CERIUM [J].