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Raman spectroscopy study of β-irradiated silica glass

2003; Elsevier BV; Volume: 325; Issue: 1-3 Linguagem: Inglês

10.1016/s0022-3093(03)00334-x

1873-4812

B. Boizot, S. Agnello, Bruno Reynard, R Boscaino, G. Petite,

Building materials and conservation

Natural and synthetic silica glass samples with different OH content have been submitted to β-irradiation at different doses from 106 to 5 × 109 Gy in a Van de Graaff accelerator. Structural changes under irradiation have been analyzed by Raman spectroscopy. The main findings are: (i) a decrease of the Si–O–Si angular dispersion and the average Si–O–Si angle as a function of dose and (ii) an increase of number of three-membered SiO4 ring concentration during irradiation. These results show therefore that purely electronic excitation from β-irradiation induces in a-SiO2 small but significant structural changes of the SiO4 membered ring statistics (size and dispersion), consistent with a slight densification.