The kinetics of defect aggregation and metal colloid formation in ionic solids under irradiation

Autor(en): Kotomin, EA
Kuzovkov, VN
Popov, AI
Stichwörter: ABSORPTION; ALKALI-HALIDES; CaF2; CENTERS; defect aggregation; defect interaction; diffusion-controlled reaction; F, H centers; F-CENTER AGGREGATION; ionic solids; LiF; LIF CRYSTALS; metal colloids; NACL; Nuclear Science & Technology; Physics; Physics, Condensed Matter; Physics, Fluids & Plasmas; precipitation and ripening; radiation defects; RADIATION-DAMAGE; SPECTROSCOPY; STORED ENERGY; TEMPERATURE
Erscheinungsdatum: 2001
Herausgeber: TAYLOR & FRANCIS LTD
Journal: RADIATION EFFECTS AND DEFECTS IN SOLIDS-INCORPORATING PLASMA SCIENCE AND PLASMA TECHNOLOGY
Volumen: 155
Ausgabe: 1-4
Startseite: 113
Seitenende: 125
Zusammenfassung: 
Results of a microscopic theory describing diffusion-controlled aggregation of radiation Frenkel defects - F and H centers - are discussed. We suggest interpretation of experimental data on metal colloid formation in the two ionic solids with different crystalline structures - LiF and CaF2 - observed under electron irradiation with subsequent heating. Theory successfully reproduces the main experimental observations including Ostwald ripening of small colloids into large colloids in the narrow temperature interval and suggests that radiation-enhanced F center diffusion occurs in CaF2 with as low activation energy as 0.4 eV In contrast, the activation energy for a single F center diffusion in LiF is found to be as high as 1.5 eV The key role of mutual defect elastic attraction in their aggregation is demonstrated.
Beschreibung: 
14th International Conference on Defects in Insulating Materials, JOHANNESBURG, SOUTH AFRICA, APR 03-07, 2000
ISSN: 10420150
DOI: 10.1080/10420150108214102

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