Surface Diffusion and Phase Transitions in Adsorbed Copper Films on (112) Tungsten Face
DOI:
https://doi.org/10.15407/ujpe67.8.619Keywords:
metals, single crystals, surface diffusion, adsorption, vapor-liquid equilibrium, two-dimensional system, thermodynamic similarityAbstract
An experimental study of the vapor-liquid equilibrium in a two-dimensional (2D) adsorbed Cu film on the (112)W face is performed in a wide temperature range for the first time. Critical characteristics are determined. The area of coexistence of phases is established. It is shown that the features of the “liquid–gas” phase transition in the 2D system of Cu–(112)W are similar to the transitions in three-dimensional (3D) systems of Rb and Cs. The reasons for the thermodynamic similarity of 2D and 3D metallic systems are discussed. Analytical expressions for the approximation of experimental data are proposed. They determine the limits of the existence of vapor-liquid equilibrium and allow a high-precision extrapolation to the regions of critical and triple points. The coordinates of the points on the liquid and gas branches of the binodals are determined on the basis of the analysis of diffusion-formed concentration profiles.
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