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Non-linear theory of diffusion of impurities in porous materials uponultrasonic treatment is described. It is shown that at a defined value ofdeformation amplitude, an average concentration of vacancies and temperature asa result of the effect of ultrasound possibly leads to the formation ofnanoclusters of vacancies and to their periodic educations in porous materials.It is shown that at a temperature smaller than some critical value, asignificant growth of a diffusion coefficient is observed in porous materials.

Non-linear model of impurity diffusion in nanoporous materials upon ultrasonic treatment