Structural properties of the range-II- and range-III order in amorphous-SiO 2 probed by electron paramagnetic resonance and Raman spectroscopy

G. Vaccaro (), G. Buscarino, S. Agnello, G. Messina, M. Carpanese and F. M. Gelardi

The European Physical Journal B: Condensed Matter and Complex Systems, 2010, vol. 76, issue 2, 197-201

Abstract: In the present work we report an experimental investigation by electron paramagnetic resonance spectroscopy on the hyperfine structure of the E' $_\gamma$ point defect, probing the local arrangement of the network (range-II order), and by Raman spectroscopy on the D 1 and D 2 lines, probing mean features of the network (range-III order). Our studies, performed on a-SiO 2 samples thermally treated at 1000 °C in air for different time durations, show that changes of the hyperfine structure and of the D 1 and D 2 lines occur in a correlated way. These results give strong evidence that the range-II and range-III order properties are intimately related to each other and that these properties are determined by the history of the material. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2010

Date: 2010
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DOI: 10.1140/epjb/e2010-00189-y

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