naa a22 4500 51081509X CHVBK 20180411083503.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1134/S0031918X13030113 doi (NATIONALLICENCE)springer-10.1134/S0031918X13030113 Magomedov M. Institute for Geothermal Problems, Dagestan Research Center, Russian Academy of Sciences, pr. Shamilya 39a, 367003, Makhachkala, Russia aut On self-diffusion in iron at very strong compression of crystal [Elektronische Daten] [M. Magomedov] The dependences of the parameters of the formation of vacancies and self-diffusion have been calculated as functions of the degree of compression of iron crystals along isotherms of 300 and 3000 K. It has been shown that, in the range of 1 > V/V 0 > (V/V 0)min, the suppression of the activation processes occurs upon isothermal compression and, upon isochoric heating, they are strengthened. Here, V/V 0 is the ratio of the molar volume of the crystal at a pressure P and temperature T to that at P = 0 and T = 0. However, at V/V 0 = (V/V 0)min = 0.0548, the probability of the formation of vacancies and the self-diffusion coefficient become minimum and, in the course of the further isothermal compression, the strengthening of activation processes occurs, and the activation parameters cease to depend on temperature. It is indicated that this is due to the quantum subbarrier tunneling of atoms over the volume of the crystal. It has been shown that, at V/V 0 < (V/V 0)fr, the surface energy is negative, which should stimulate the process of the fragmentation of the crystal and that (V/V 0)fr > (V/V 0)min. The isothermal dependence of pressure in bcc iron has been estimated upon its compression to V/V 0 = 0.001. Based on the calculated isotherms, the magnitudes of pressure at characteristic points of pressure dependences of the parameters of self-diffusion and surface energy have been estimated. Pleiades Publishing, Ltd., 2013 self-diffusion nationallicence vacancies nationallicence pressure nationallicence Debye temperature nationallicence Grüneisen parameter nationallicence surface energy nationallicence The Physics of Metals and Metallography SP MAIK Nauka/Interperiodica 114/3(2013-03-01), 207-216 0031-918X 114:3<207 2013 114 11508 https://doi.org/10.1134/S0031918X13030113 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0031918X13030113 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Magomedov M. Institute for Geothermal Problems, Dagestan Research Center, Russian Academy of Sciences, pr. Shamilya 39a, 367003, Makhachkala, Russia aut NATIONALLICENCE 773 0- The Physics of Metals and Metallography SP MAIK Nauka/Interperiodica 114/3(2013-03-01), 207-216 0031-918X 114:3<207 2013 114 11508 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer