Compositional changes in irradiated dielectric crystals
作者:
C.A. De Paula,
S. Lauck,
P.C. T. D'Ajello,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1997)
卷期:
Volume 140,
issue 3-4
页码: 295-305
ISSN:1042-0150
年代: 1997
DOI:10.1080/10420159708216853
出版商: Taylor & Francis Group
关键词: Ion irradiation;Diffusion;Electric field assisted migration;Preferential sputtering
数据来源: Taylor
摘要:
We have stuided the sodium migration in β″-alumina systems irradiated by heavy energetic ions. The phenomenon has been discussed in terms of transport equations which include three main processes: radiation enhanced diffusion, electric field assisted migration and preferential sputtering of the alkali element. We have developed a theoretical model which describes the process relating the diffusion constant, the sodium mobility and the electric field function to the characteristic effects of the radiation. The numerical solutions of this model indicate a Na+compositional profile strongly dependent on the form of the electric field function. A comparison with experimental results suggested an additional step in the procedure, which includes a subsequent bombardment of the sample with protons. This step simulates the acquisition of the profile by nuclear reaction techniques and adequately describes the experimental results.
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