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Titolo:
New formulation of the modeling of radiation-induced microstructure evolution in alkali halides
Autore:
Dubinko, VI; Turkin, AA; Vainshtein, DI; den Hartog, HW;
Indirizzi:
Univ Groningen, Solid State Phys Lab, NL-9747 AG Groningen, Netherlands Univ Groningen Groningen Netherlands NL-9747 AG G Groningen, Netherlands Kharkov Phys & Technol Inst, UA-310108 Kharkov, Ukraine Kharkov Phys & Technol Inst Kharkov Ukraine UA-310108 8 Kharkov, Ukraine
Titolo Testata:
RADIATION EFFECTS AND DEFECTS IN SOLIDS
fascicolo: 1-4, volume: 150, anno: 1999,
pagine: 145 - 149
SICI:
1042-0150(1999)150:1-4<145:NFOTMO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
BUBBLE;
Keywords:
radiation damage; alkali halides; microstructure evolution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
7
Recensione:
Indirizzi per estratti:
Indirizzo: Vainshtein, DI Univ Groningen, Solid State Phys Lab, 4 Nijenborgh, NL-9747AG Groningen, Netherlands Univ Groningen 4 Nijenborgh Groningen Netherlands NL-9747 AG
Citazione:
V.I. Dubinko et al., "New formulation of the modeling of radiation-induced microstructure evolution in alkali halides", RADIAT EFF, 150(1-4), 1999, pp. 145-149

Abstract

Recent experimental results on heavily irradiated natural and synthetic NaCl crystals give a strong evidence for the formation of large vacancy voids, which cannot be explained by the Jain-Lidiard model used up to date for description of metal colloids and dislocation loops formed during earlier stages of irradiation. We propose a new mechanism of dislocation climb, whichinvolves production of cation Vacancies (with a trapped hole) as a result of absorption of extra Ii centers. We consider an additional set of reactions between experimentally observed extended defects (dislocations, metal colloids, gas bubbles and voids) and point defects. The latter include F and N centers that are the primary defects produced by irradiation, and cation vacancies that are secondary defects produced in the process of dislocationclimb. We show that highly overpressurized bubbles of fluid halogen are strongly biased for absorption of H centers, which makes them grow via punching out interstitial dislocation loops. The loops grow and produce cation vacancies that are subsequently trapped at the surfaces of extended defects, such as the incoherent colloids, and recombine with extra F centers giving rise to the void formation. Elastic interaction between extended defects and point defects is shown to play a major role, since it determines the biasfactors of extended defects, which is a major driving force of the microstructural evolution under irradiation.

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Documento generato il 07/07/20 alle ore 15:29:11