1.
Phys Rev Lett
; 91(24): 245502, 2003 Dec 12.
Article
in English
| MEDLINE
| ID: mdl-14683133
ABSTRACT
We report proton radiation enhanced self-diffusion (RESD) studies on Si-isotope heterostructures. Self-diffusion experiments under irradiation were performed at temperatures between 780 degrees C and 872 degrees C for various times and proton fluxes. Detailed modeling of RESD provides direct evidence that vacancies at high temperatures diffuse with a migration enthalpy of H(m)(V)=(1.8+/-0.5) eV significantly more slowly than expected from their diffusion at low temperatures, which is described by H(m)(V)<0.5 eV. We conclude that this diffusion behavior is a consequence of the microscopic configuration of the vacancy whose entropy and enthalpy of migration increase with increasing temperature.
2.
Minerva Anestesiol
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Article
in Italian
| MEDLINE
| ID: mdl-10389436
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Article
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| MEDLINE
| ID: mdl-8611270
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Article
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| MEDLINE
| ID: mdl-10005741
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Article
in English
| MEDLINE
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