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RESEARCH PRODUCT
Aggregation of Frenkel defects under irradiation: a mesoscopic approach
Eugene A. KotominWim J. J. Soppesubject
Nuclear and High Energy PhysicsMesoscopic physicsMaterials sciencemedia_common.quotation_subjectAggregation rateAsymmetryCrystallographyImpurityChemical physicsCritical doseIrradiationDose rateInstrumentationmedia_commondescription
The radiation-induced aggregation of Frenkel defects in solids is studied in terms of a mesoscopic approach. The asymmetry in elastic interactions between mobile interstitials (I-I) and between interstitials and vacancies (I-V) plays a decisive riile in the aggregation of similar defects. The conditions for defect aggregation are studied in detail for NaCl crystals. The critical dose rate for aggregation has been calculated as a function of the temperature as well as the aggregation rate as a function of temperature and dose rate. Furthermore, the r&e of deep traps (like impurities and di-vacancies), reducing the mobility of interstitials, and the r&le of dislocations serving as sinks for interstitials, are studied. The aggregation appears to reach a m~mum at a distinct temperature which is in agreement both with experiment and the Jam-Lid&d theory. The model aIso predicts a shift of this maximum towards lower temperatures if the dose rate is decreased. The consequences of the model for the disposal of nuclear waste in rock salt formations are briefly discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1994-06-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |