Photoplastic Effect in Narrow-Gap Mercury Chalcogenide Crystals

• Дата: 2018
• Автори: Koman, B.P., Balitskii, O.O., Leonov, D.S.
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут металофізики ім. Г.В. Курдюмова НАН України 2018
• Назва видання: Металлофизика и новейшие технологии
• Теми: Физика прочности и пластичности
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/145946
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Photoplastic Effect in Narrow-Gap Mercury Chalcogenide Crystals / B.P. Koman, O.O. Balitskii, D.S. Leonov // Металлофизика и новейшие технологии. — 2018. — Т. 40, № 4. — С. 529-540. — Бібліогр.: 28 назв. — англ.

The paper elucidates the peculiarities of photoplasticization effect (PPE) occurring in narrow-gap crystals of mercury chalcogenides illuminated by white light during the process of uniaxial deformation. As found, the irradiation has an influence on the plastic deformation in narrow-gap CdxHg₁₋xTe crystals. Negative photoplasticization effect (NPPE) described here is concerned with reducing of plastic stress fluidity under white-light irradiation during plastic deformation of crystals at a constant rate. As found, in contrary to wide-bandgap crystals of the II–VI groups exhibiting positive PPE, NPPE observed in CdxHg₁₋xTe occurs without internal photoeffect. A model explaining the nature of NPPE relies on a decreasing of positive charge in a native oxide layer at the surface of crystal. Charge decreasing reduces potential barrier for exiting on surface of dislocations generated by near-surface sources during dynamical loading. As a result, the level of fluidity stress in the deformed crystal is reduced.