On the exciton model for ion-beam damage: The example of TiO2

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:268

Article; Proceedings Paper

Rivera, A.²  Crespillo, M. L.³  Olivares, J.^3,4  Sanz, R.⁵  Jensen, J.⁶  Agullo-Lopez, F.^1,3 

[1] Univ Autonoma Madrid, Dept Fis Mat, E-28049 Madrid, Spain

[2] CNM CSIC, Inst Microelect Madrid, E-28760 Tres Cantos, Spain

[3] Univ Autonoma Madrid, Ctr Microanal Mat CMAM, E-28049 Madrid, Spain

[4] CSIC, Inst Opt, E-28006 Madrid, Spain

[5] Inst Ciencia Mat Madrid ICMM CSIC, E-28049 Madrid, Spain

[6] Linkoping Univ, Dept Phys Chem & Biol IFM, Thin Film Phys Div, SE-58183 Linkoping, Sweden

关键词: Damage;    Excitons;    Ion beams;    Rutile;    RBS/C;    Channelling amorphization threshold;   

DOI  :  10.1016/j.nimb.2010.05.068

来源: Elsevier

【 摘 要 】

The non-radiative exciton decay model recently developed to account for swift-ion-beam damage to LiNbO3 is, here, discussed within a general physical perspective, taking previous work on alkali halides as a reference. Some general rules for the validity of excitonic models have been put forward, allowing one to predict the irradiation behaviour of other materials. As a new example of application, some preliminary data on the generation and growth of uniform amorphous layers induced by irradiation with Br at 13 MeV and 25 MeV have been performed on rutile (TiO2). In addition sub-threshold irradiations with Br ions at 9 MeV have been carried out. Defects generation is observed as a result. This effect is explained with the exciton model. Experiments are in the electronic excitation regime and use moderate fluences in the range of 6 x 10(12) to 1.5 x 10(14) cm(-2). The results show similar features to those found for LiNbO3 and are, in principle, consistent with a non-radiative exciton decay model. (C) 2010 Elsevier B.V. All rights reserved.

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