The study of the influence of X-ray irradiation on dislocation characteristics in LiF crystals

• Дата: 2021
• Автори: Petchenko, О.M., Petchenko, G.О., Boiko, S.M., Litvinenko, А.S.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2021
• Назва видання: Вопросы атомной науки и техники
• Теми: Physics of radiation damages and effects in solids
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/195455
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: The study of the influence of X-ray irradiation on dislocation characteristics in LiF crystals / О.M. Petchenko, G.О. Petchenko, S.M. Boiko, А.S. Litvinenko // Problems of Atomic Science and Technology. — 2021. — № 5. — С. 21-25. — Бібліогр.: 31 назв. — англ.

The dependences of the absorption α and the ultrasound velocity in LiF single crystals with residual deformation ε = 0.65% at 300 K in the range of radiation doses 0...1057 R were studied using the acoustic pulse echo method at a frequency of 7.5 MHz. Based on the results of measurements of the acoustic characteristics, the absolute values of the parameters of the dislocation structure – the average effective length of the dislocation loop L and the dislocation density Λ and their dependences on the irradiation time are determined. The calculated characteristics are compared with the previously obtained results for the high-frequency branch of the damped dislocation resonance and using the selective etching method. The revealed noticeable discrepancy in the values of these parameters is explained by the impossibility of describing a single attenuation mechanism for acoustic measurements carried out in a wide frequency range.