First-Order Liquid-Liquid Phase Transition in Cerium

被引：121

作者：

Cadien, A. ^{[1
]}

Hu, Q. Y. ^{[1
]}

Meng, Y. ^{[2
]}

Cheng, Y. Q. ^{[3
]}

Chen, M. W. ^{[4
]}

Shu, J. F. ^{[5
]}

Mao, H. K. ^{[2
,5
]}

Sheng, H. W. ^{[1
,6
]}

机构：

[1] George Mason Univ, Sch Phys Astron & Computat Sci, Fairfax, VA 22030 USA

[2] Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA

[3] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA

[4] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[5] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[6] George Mason Univ, Ctr Computat Mat Sci, Fairfax, VA 22030 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 12期

基金：

美国国家科学基金会;

关键词：

SUPERCOOLED SILICON; METALLIC-GLASS; HIGH-PRESSURE; PHOSPHORUS; BEHAVIOR; WATER;

D O I：

10.1103/PhysRevLett.110.125503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first experimental observation of a liquid-liquid phase transition in the monatomic liquid metal cerium, by means of in situ high-pressure high-temperature x-ray diffraction experiments. At 13 GPa, upon increasing temperature from 1550 to 1900 K high-density liquid transforms to a low-density liquid, with a density difference of 14%. Theoretic models based on ab initio calculations are built to investigate the observed phase behavior of the liquids at various pressures. The results suggest that the transition primarily originates from the delocalization of f electrons and is deemed to be of the first order that terminates at a critical point. DOI: 10.1103/PhysRevLett.110.125503

引用

页数：5

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