Brillouin spectroscopy of natural and chemically complex volcanic glasses: The role of divalent cations
Year: 2025
Type: article
Abstract: This work investigates using Brillouin light scattering (BLS) spectroscopy the relationship between chemistry and longitudinal (or pressure) sound-wave propagation on a large dataset of alkaline to sub-alkaline silicate glasses . Results show that the frequency f B of the Brillouin peak decreases with the silica content and the Silica vs. Calcia - Ferrous oxide - Magnesia (SCFM) parameter, while it increases with the degree of polymerization expressed by the ratio of nonbridging oxygens to tetrahedral cations (NBO/T). It is possible to infer that the values of both f B and the real part of the longitudinal elastic modulus M' are tightly related to the content of divalent cations (M 2+ ) participating in the silicate network. Our findings suggest that alkaline earth metals and Fe 2+ linearly speed up the longitudinal acoustic waves in silicate glasses. This might open a new window on the possibility of using the BLS technique for rapid and accurate determinations of physical and chemical properties of natural glasses present on Earth and other planetary bodies.
Source: Chemical Geology
Authors: Alessandro Pisello, Silvia Corezzi, Michele Cassetta, Francesco Radica, Lucia Comez, Gianluca Iezzi, Andrea Vitrano, Francesco Pasqualino Vetere, Diego Perugini
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,550
Funders: European Commission, Ministero dell’Istruzione, dell’Università e della Ricerca, Agenzia Spaziale Italiana, Gottfried Wilhelm Leibniz Universität Hannover, Fondazione Cassa di Risparmio di Perugia, Università degli Studi G. d'Annunzio Chieti - Pescara, European Research Council, Ministero dell'Istruzione e del Merito
OpenAlex ID: W4408240924