| Autor: |
Abdenacer Benyagoub, S. Bouffard, M. Rebetez, M. Grivet, F. Levesque, R. Tisserand, J. Carpéna |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 215:129-136 |
| ISSN: |
0168-583X |
| DOI: |
10.1016/j.nimb.2003.08.001 |
| Popis: |
Samples of monosilicated sintered fluorapatite (Ca 9 Nd(PO 4 ) 5 (SiO 4 )F 2 , britholite) and full-phosphated Durango fluorapatite were irradiated using different heavy ions with incident energies in the range of several hundred MeV, corresponding to the electronic stopping power regime. The induced damage was characterized by means of X-ray diffraction for the monosilicated fluorapatites and Rutherford backscattering spectrometry associated with channeling technique (CRBS) for the Durango fluorapatites. Characterizing the amorphization of the monosilicated fluorapatites revealed two main features. First, the evolution of the damaged fraction with the ion fluence and the ion species shows that amorphization is mainly dependent on the electronic energy loss ( S e ) value. Second, we suggest that a percolation of defects only occurs when S e is above a threshold near 5 keV nm −1 . This can be related to the limit of a fragmentation zone defined from microscopic observations. We have quantified damage in monosilicated fluorapatites by calculating amorphization effective radii ( R e ). By plotting these results versus S e , we found that they are in good agreement with those obtained from the irradiated single crystals of Durango fluorapatite. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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