Amorphous structures in the immiscible Ag-Ni system

被引：102

作者：

He, JH ^{[1
]}

Sheng, HW

Schilling, PJ

Chien, CL

Ma, E

机构：

[1] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

[2] Univ New Orleans, Dept Engn Mech, New Orleans, LA 70145 USA

[3] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.86.2826

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Vapor quenching in the phase-separating Ag-Ni system creates alloys that appear homogeneously amorphous under conventional probes. However, an atomic-level structural analysis based on extended x-ray absorption fine structures in combination with reverse Monte Carlo and molecular dynamics simulations demonstrates that these new phases are characterized by nonuniform, spinodal-like structures on an extremely fine scale. This heterogeneous nature of the structure is directly responsible for the unexpectedly low heat (and temperature) of crystallization observed in calorimetric measurements.

引用

页码：2826 / 2829

页数：4

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