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On the melting-crystallization criterion and the energy of activation processes for nanocrystals

M. N. Magomedov

Institute of Geothermy Problems, Makhachkala

Abstract: It is shown that the localization criterion for the crystal-liquid phase transition introduced earlier for macrostructures is also valid for nanocrystals. The variation of the parameters of activation processes (formation of vacancies and self-diffusion) with a decrease in the nanocrystal size is investigated. It is shown that the lattice of a nanocrystal is more perfect than that of a macrocrystal at low temperatures, while at high temperatures, the nanocrystal is activated by mobile vacancies to a greater extent than the macrocrystal.

Received: 21.09.2009
Accepted: 24.12.2009

 English version: Technical Physics, 2010, 55:9, 1373–1377

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