Formation of metallic nanophases in silica by ion beam mixing. Part II: cluster formation |
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| Authors: | L. Thomé G. Rizza F. Garrido M. Gusso L. Tapfer A. Quaranta |
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| Affiliation: | (1) Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS, F-91405 Orsay Campus, France, FR;(2) Centro Nazionale per la Richerca e lo Sviluppo dei Materiali, S.S. 7 Appia km 714, I-72100 Brindisi, Italy, IT;(3) Unita INFM di Padova, Dipartimento di Fisica, Dipartimento di Ingegneria dei Materiali, Universita di Trento, I-38050 Mesiano, Italy, IT |
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| Abstract: | 2 matrix by ion-beam mixing of SiO2/Ag multilayers is studied via Rutherford backscattering spectrometry, optical absorption, and transmission electron microscopy experiments. In a first step, irradiation with MeV heavy ions transforms the continuous Ag layers into a string of micrometer-sized Ag inclusions. This mechanism can be attributed to lateral segregation of metallic atoms induced by irradiation. In a second step, the Ag inclusions are broken up by incoming ions and Ag nanoclusters are formed by agglomeration of mobile Ag atoms. The latter mechanism is likely due to a combination of ballistic mixing and radiation-induced segregation or radiation-enhanced diffusion processes. The size of the metallic nanoclusters formed depends also on the irradiation temperature. Received: 27 October 1997/Accepted: 3 February 1998 |
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| Keywords: | PACS: 61.16.Di 61.80.Jh 78.65.-s |
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