Title: Non-linear model of impurity diffusion in nanoporous materials upon ultrasonic treatment
Author(s):

	R.M. Peleshchak (Drohobych Ivan Franko State Pedagogical University, 24 I.Franko St., 82100 Drohobych, Ukraine) ,
	O.V. Kuzyk (Drohobych Ivan Franko State Pedagogical University, 24 I.Franko St., 82100 Drohobych, Ukraine) ,
	O.O. Dan'kiv (Drohobych Ivan Franko State Pedagogical University, 24 I.Franko St., 82100 Drohobych, Ukraine)

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

Key words: diffusion coefficient, ultrasound, vacancy, pore
PACS: 66.30.Lw, 43.35.Fj

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