Relaxation study of pre-densified silica glasses under 2.5 MeV electron irradiation
SCIENTIFIC REPORTS(2019)
摘要
We examined the “relaxation properties” of pre-densified synthetic fused silica glass under 2.5 MeV electron irradiation. The densification of the glass was either obtained by hot compression (5 GPa-350 °C and 5 GPa-1000 °C) or via a thermal treatment increasing its fictive temperature (T f = 1050, 1250 and 1400 °C). Under irradiation, the pre-densified silica glasses exhibit a relaxation of their macroscopic density with increasing integrated dose. Density was reduced for hot compressed silica and increased for T f samples with different relaxation rates but it is remarkable that all sample densities follow a trend towards the same equilibrium value around 2.26 for a dose larger than 10 GGy despite a different final topology. After irradiation of hot compressed silica, the Raman spectra display a significant increment of 4 and almost 3-membered rings whereas they exhibit a glass density reduction; demonstrating that a D 2 band increase cannot be considered as an absolute marker of the glass compaction. The correlation between density and D 2 intensity remains valid until silica density remains lower than 2.26. In contrast, the FWHM of the main band peaking at 440 cm −1 appears to remain correlated to the silica glass density for all investigated samples.
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关键词
Materials for optics,Materials science,Science,Humanities and Social Sciences,multidisciplinary
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