Funct. Mater. 2025; 32 (2): 250-258.
The formation and decomposition of anomalous solutions of tantalum in copper condensates
1National Technical University "Kharkiv Polytechnic Institute", 2, Kyrpychova str., 61002 Kharkiv, Ukraine
2Department of Physics and NTIS – European Centre of Excellence, University of West Bohemia, Univerzitní 8, 306 14, Plzeň, Czech Republic
3National Science Center Kharkov Institute of Physics and Technology, 1 Akademichna str., 61108 Kharkiv, Ukraine
The structure of condensates of the binary Cu-Ta system, in which there are no chemical compounds and mutual solubility under equilibrium conditions in the solid and liquid states, has been studied. It is shown that under certain technological conditions for obtaining condensate, an anomalous tantalum solution is formed in the fcc crystal lattice of copper. It is found that the degree of solubility increases with increasing tantalum concentration, deposition rate and decreasing substrate temperature. It is assumed that the formation of the solution occurs as a result of kinetic capture of tantalum atoms by the crystallization front. It is shown that irreversible decomposition of the anomalous solution occurs at temperatures above 500°С and is accompanied by the effect of dispersive solidification.
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