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Title: On the defect pattern evolution in sapphire irradiated by swift ions in a broad fluence range
Authors: Gordo, P. M. 
Liszkay, L. 
Kajcsos, Zs. 
Havancsák, K. 
Skuratov, V. A. 
Kögel, G. 
Sperr, P. 
Egger, W. 
Lima, A. P. de 
Marques, M. F. Ferreira 
Keywords: Sapphire; Positron lifetimes; Doppler broadening; Defects; Positron trapping
Issue Date: 1-Sep-2008
Citation: Applied Surface Science. In Press, Corrected Proof:
Abstract: Sapphire samples, irradiated with swift Kr (245 MeV) ions at room temperature in a broad fluence range, were investigated using a continuous and a pulsed positron beam to study the defect structure created by the passage of the ions in depths of a few micrometers. At small doses, monovacancies were identified as dominant defects and positron trapping centres. These monovacancies are assumed to be highly concentrated inside a cylindrical volume around the ion path with an estimated radius of ~1.5 nm. For higher doses a second type of trapping centre emerges. This second class of structural imperfection was associated with the overlap of the individual ion tracks leading to the formation of larger vacancy clusters or voids.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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