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FRANCO MARIO GELARDI

Structural properties of the range-II- and range-III order in amorphous-SiO2 probed by electron paramagnetic resonance and Raman spectroscopy

  • Authors: Vaccaro, G; Buscarino, G; Agnello, S; Messina, G; Carpanese, M; Gelardi, FM
  • Publication year: 2010
  • Type: Articolo in rivista (Articolo in rivista)
  • Key words: Silica, difetti di punto, proprieta' struturali
  • OA Link: http://hdl.handle.net/10447/51170

Abstract

In the present work we report an experimental investigation by electron paramagnetic resonance spectroscopy on the hyperfine structure of the E γ point defect, probing the local arrangement of the network (range-II order), and by Raman spectroscopy on the D1 and D2 lines, probing mean features of the network (range-III order). Our studies, performed on a-SiO2 samples thermally treated at 1000 ◦ C in air for different time durations, show that changes of the hyperfine structure and of the D1 and D2 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.