Low-temperature behavior of core-softened models: Water and silica behavior

被引：88

作者：

Jagla, EA ^{[1
]}

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

来源：

PHYSICAL REVIEW E | 2001年 / 63卷 / 06期

关键词：

D O I：

10.1103/PhysRevE.63.061509

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

A core-softened model of a glass forming fluid is numerically studied in the limit of very low temperatures. The model shows two qualitatively different behaviors depending on the strength of the attraction between particles. For no or low attraction, the changes of density as a function of pressure are smooth, although hysteretic due to mechanical metastabilities. For larger attraction, sudden changes of density upon compressing and decompressing occur. This global mechanical instability is correlated to the existence of a thermodynamic first-order amorphous-amorphous transition. The two different behaviors obtained correspond qualitatively to the different phenomenology observed in silica and water.

引用

页数：7

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