Interface thermodynamics of nano-sized crystalline, amorphous and liquid metallic systems

被引：0
|
作者：
Sommer, F. [1 ]
Singh, R.N. [2 ]
Mittemeijer, E.J. [1 ]
机构：
[1] Max Planck Institute for Metals Research, Heisenbergstrasse 3, 70569 Stuttgart, Germany
[2] Physics Department, S Q University, PO Box 36, 123-SQU, Oman
来源：
Journal of Alloys and Compounds | 2009年 / 467卷 / 1-2期
关键词：
Expressions for the Gibbs energies of interfaces occurring in particular for solid and/or liquid/amorphous metals or alloys in contact with each other have been developed. To consider its energetics; an amorphous alloy has been modelled as a mixture of the undercooled liquid metal components near to the glass transition temperature making use of the enthalpy of melting; the entropy of melting and the temperature-dependent contribution of the heat capacity of the undercooled melt. Gibbs surface and interface energies have been obtained on the basis of the macroscopic atom Miedema model; where the entropy contributions of alloys have been derived applying a recently developed formalism. The Gibbs energy of a crystalline interface phase has been formulated. The molar fractions of the components of the alloy at the surfaces have been determined by minimising the surface energy. These results provide a thermodynamic basis for unusual phenomena observed in nano-sized systems. The formalism has been applied to calculate the thermodynamic stability of interface phases in a nano-sized; multi-layered system of iron and zirconium and to explain the aluminium-induced crystallisation of amorphous silicon and the layer exchange occurring in bi-layers of crystalline aluminium and amorphous silicon. © 2007 Elsevier B.V. All rights reserved;
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页码：142 / 153
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