Тhe competition of mott and frideel type stoppers as the main blocking mechanisms in mobile dislocations of KBr crystals

• Дата: 2018
• Автори: Petchenko, О.M., Petchenko, G.О., Boiko, S.M.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2018
• Назва видання: Вопросы атомной науки и техники
• Теми: Физика радиационных повреждений и явлений в твердых телах
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/147695
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Тhe competition of mott and frideel type stoppers as the main blocking mechanisms in mobile dislocations of KBr crystals / О.M. Petchenko, G.О. Petchenko, S.M. Boiko // Вопросы атомной науки и техники. — 2018. — № 5. — С. 24-28. — Бібліогр.: 40 назв. — англ.

The experimental data of pulsed-method research in the frequency range 7.5...232.5 MHz of the preliminary deformation effect ε in the range of 0.23…1%, and at the temperature interval 77...300 K on the frequency spectra localization Δd(f) in the dislocation decrement of ultrasonic attenuation, as well as on dynamic (B) and structural characteristics (L, Λ) of KBr crystals. The competition of strong and weak stoppers in the processes of blocking mobile dislocations in the investigated crystals is vividly traced. The limiting value of ε = 2.25% is established, above which the thermal activation of the mobile dislocations' detachment from Friedel type stoppers is completely masked by more efficient processes of fixing dislocations by dislocation network nodes (Mott stoppers), which gave us grounds to recommend performing of further studies in this direction.