Influence of Fluctuations of the Point-Defects’ Generation Rate and Inhomogeneity of Irradiated F.C.C. Crystal on the Temperature Dependence of the Dissipative-Structure Period in a Spatial Distribution of Radiation Vacancies

摘要

A kinetic model for the influence of external noise, such as fluctuations of the point-defects’ productionudrate and inhomogeneity of irradiated f.c.c. crystal, on the formation of modulated defect-distribution structureudis considered. Defect-production rate and density of sinks for point defects are simulated as independentuduniform and stationary stochastic fields with certain parameters. The interaction between vacancies isudtaken into account. Such stochastic fields can induce a spatial point-defects’ distribution, which is a stationaryuduniform stochastic field. Its mean value and correlation functions are estimated, and restrictingudconditions are determined when this stochastic field becomes unstable because of interaction between defect-uddensity fluctuations and a stochastic field with a spatially-periodic mean value is formed. A formulaudfor evaluating its spatial period is analysed. This geometrical parameter of such a dissipative structure isuddetermined also by kinetic characteristics.When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35438