Polyamorphic transitions in Ce-based metallic glasses by synchrotron radiation

被引：37

作者：

Duarte, M. J. ^{[1
,2
]}

Bruna, P.

Pineda, E. ^{[3
]}

Crespo, D.

Garbarino, G. ^{[4
]}

Verbeni, R. ^{[4
]}

Zhao, K. ^{[5
]}

Wang, W. H. ^{[5
]}

Romero, A. H. ^{[2
]}

Serrano, J. ^{[1
]}

机构：

[1] Univ Politecn Cataluna, EPSC, Dept Fis Aplicada, ICREA, E-08860 Castelldefels, Spain

[2] CINVESTAV, Unidad Queretaro, Dept Mat, Queretaro 76230, Mexico

[3] Univ Politecn Cataluna, ESAB, Dept Fis & Engn Nucl, E-08860 Castelldefels, Spain

[4] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France

[5] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 22期

关键词：

LIQUID PHASE-TRANSITION; HIGH-PRESSURE; DENSITY; SILICON; SYSTEMS; CERIUM;

D O I：

10.1103/PhysRevB.84.224116

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report here on a polyamorphic-phase transition upon application of pressure on a Ce-based metallic glass, Ce(70)Al(10)Ni(10)Cu(10), investigated by x-ray diffraction and inelastic x-ray scattering. This alloy is found to display a strong hysteresis in volume per atom upon application and subsequent release of pressure. The observed structural changes are correlated with changes observed by inelastic x-ray scattering in the elastic constants, acoustic mode frequencies, and sound speed. The results reported here point toward three different amorphous phases for this alloy existing in the 0-25 GPa pressure region: low-and high-density states and an intermediate mixed state that displays a hysteresis behavior. Finally, we discuss the impact of Ce concentration on the polyamorphic transition for a series of Ce-based metallic glass alloys and link it to the phase transformation between gamma-Ce and alpha-Ce under pressure.

引用

页数：7

共 33 条

[31] Origin of Pressure-Induced Polyamorphism in Ce75Al25 Metallic Glass [J].