Amorphous structures in the immiscible Ag-Ni system.
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.
He
J H
JH
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA.
Sheng
H W
HW
Schilling
P J
PJ
Chien
C L
CL
Ma
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