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U. G. Magomedbekov, M. M. Khamidov, M. Kh. Rabadanov, G. D. Soltamuradov, I. I. Khasanov

Fluctuations of the impurity photoconductivity in crystals of cadmium sulphoselenide doped with potassium: non-equilibrium thermodynamics and mathematical modeling

Abstract

The results of analysis by methods of nonlinear nonequilibrium thermodynamics and mathematical modeling of fluctuations of the impurity photoconductivity in monocrystals sulfoselenides of cadmium doped potassium when they are irradiated by impurity light. Based on nonlinear thermodynamics, it is established that the loss of stability of the system and the manifestation of critical phenomena is possible when the system under study implemented autocatalytic stage and a negative feedback. Based on the results of the qualitative analysis and numerical integration of the mathematical model obtained, what implements one stationary state of the type “unstable focus”; the conclusion is made about the occurrence of critical phenomena as a result of bifurcation of Andronov-Hopf type of the singular point in the limit cycle; it is shown that the proposed mathematical model satisfactorily describes the regularities of manifestation of the fluctuation effects.
Key words: sulphoselenide cadmium, alloying, potassium, monocrystal, impurity photoconductivity, fluctuations, nonequilibrium thermodynamics, mathematical modeling, bifurcation.
Moscow University Chemistry Bulletin.
2019, Vol. 60, No. 1, P. 41
   

Copyright (C) Chemistry Dept., Moscow State University, 2002
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