Glass Physics and Chemistry

, Volume 39, Issue 5, pp 527–532 | Cite as

Study of damage initiation in SiO2 glass and ceramics by fractoluminescence and acoustic emission techniques

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Abstract

The results of high-rate detection of fractoluminescence (FL) and acoustic emission (AE) induced by the shock destruction of the surface of silica glass and silica ceramics are presented. The FL arises as a result of breaking covalent bonds, and the growing microscopic and larger cracks are a source of AE. The intensities of FL and AE are proportional to the energy released by the follow of defects. It is shown that the energy distribution of the energy in the FL signals registered after the shock follows the power law characteristic for cooperative processes in nonequilibrium thermodynamic systems. Qualitatively similar results were obtained for a ceramics not subjected to high-temperature treatment, sintered ceramics, and monolithic glass. This means that the damage initiation at the nanostructural level is always a correlated process. In the series of AE signals, the power law distribution of the energy was found only for sintered ceramics. Cooperative phenomena in AE generation are not observed for unsintered ceramics and silica glass.

Keywords

silica glass silica ceramics shock destruction fractoluminescence acoustic emission 

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© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  1. 1.Ioffe Physicotechnical InstituteRussian Academy of SciencesSt. PetersburgRussia

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