Abstract
High pressure may pave the way towards atypical phenomena and properties in glass science. Through compression, vitreous silica presents a well-established elastic anomaly (EA) and the scarcely investigated elastic modulus anomaly (EMA). In this paper, we present a study of the EMA for the densified lead metasilicate (PbSiO3) glass, despite its low silica content and lack of the classical EA. PbSiO3 glass was densified in diamond anvil cell and Belt press apparatus and analyzed by Brillouin spectroscopy and, when applicable, spectroscopic ellipsometry. The elastic modulus anomaly is characterized by a decrease in the longitudinal sound velocity of the densified glass compared to the uncompressed glass and attributed to the low glass ability to undergo significant densification. Densification pathways in PbSiO3 glass are discussed in light of in-situ Brillouin and Raman probes.
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