Stabilization of primary mobile radiation defects in MgF2 crystals; Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms; Vol. 374 : Basic Research on Ionic-Covalent Materials

Stabilization of primary mobile radiation defects in MgF2 crystals

Dettagli Bibliografici
Parent link:Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms.— , 1984-
Vol. 374 : Basic Research on Ionic-Covalent Materials.— 2016.— [P. 24-28]
Ente Autore: Национальный исследовательский Томский политехнический университет Институт физики высоких технологий Кафедра лазерной и световой техники
Altri autori: Lisitsyn V. M. Viktor Mikhailovich, Lisitsyna L. A. Lyudmila Aleksandrovna, Popov A. I. Aleksandr Ivanovich, Kotomin E. A. Evgeny Aleksandrovich, Abuova F. U. Fatima Usenovna, Akilbekov A. T. Abdirash Tasanovich, Maier J.
Riassunto:Title screen
Non-radiative decay of the electronic excitations (excitons) into point defects (F–H pairs of Frenkel defects) is main radiation damage mechanism in many ionic (halide) solids. Typical time scale of the relaxation of the electronic excitation into a primary, short-lived defect pair is about 1–50 ps with the quantum yield up to 0.2–0.8. However, only a small fraction of these primary defects are spatially separated and survive after transformation into stable, long-lived defects. The survival probability (or stable defect accumulation efficiency) can differ by orders of magnitude, dependent on the material type; e.g. ?10% in alkali halides with f.c.c. or b.c.c. structure, 0.1% in rutile MgF2 and <0.001% in fluorides MeF2 (Me: Ca, Sr, Ba). The key factor determining accumulation of stable radiation defects is stabilization of primary defects, first of all, highly mobile hole H centers, through their transformation into more complex immobile defects. In this talk, we present the results of theoretical calculations of the migration energies of the F and H centers in poorely studied MgF2 crystals with a focus on the H center stabilization in the form of the interstitial F2 molecules which is supported by presented experimental data.
Режим доступа: по договору с организацией-держателем ресурса
Lingua:inglese
Pubblicazione: 2016
Soggetti:
электронный ресурс
труды учёных ТПУ
экситоны
радиационные дефекты
Accesso online:http://dx.doi.org/10.1016/j.nimb.2015.08.002
Natura: Elettronico Capitolo di libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=648589

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