Cold- and hot-densification of a depolymerized glass: A multiscale vibrational investigation of PbSiO3
Source abstract
Abstract
In this study, we investigated the effect of different compression routes on the lead metasilicate (PbSiO 3) composition. Glass samples were compressed in a Belt press up to 5 GPa at room temperature (cold compression) and high temperatures (hot compression) up to 673 K, both at comparable experimental conditions concerning pressure and temperature gradients and times. The set of densified glasses was analyzed ex-situ by Brillouin, Raman and infrared spectroscopies, providing a multiscale structural probe. The dataset revealed a progressive decrease in the refractive index-weighted longitudinal sound velocities for the cold-compression and a minimum at about 450 K for hot-compression. Raman and infrared analyses indicate increasing depolymerization of the silicate network as an effect of densification, which is more pronounced at higher temperatures. Moreover, distinct mechanical properties are discussed regarding the inherent structural modifications resulting from the compression treatments.
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Research context
OpenAlex topics: Glass properties and applications · Material Dynamics and Properties · Phase-change materials and chalcogenides
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