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The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
Published on: November 6, 2021
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Chemically Driven Nano-Elastic Heterogeneities Control Fragility in Volcanic Melts
Michele Cassetta1,2, Daria Szewczyk3, Gabriele Giuliani4
1Department of Engineering for Innovation Medicine, University of Verona, Verona, I-37134, Italy.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 8, 2025
Summary
This study explores how nanoscale structures in volcanic glasses influence mechanical properties. Increased silica content correlates with greater structural heterogeneity, impacting elastic moduli and melt fragility.
Area of Science:
- Geochemistry
- Materials Science
- Physics
Background:
- Volcanic glasses exhibit complex mechanical behaviors influenced by their nanoscale structure.
- Understanding the relationship between composition and rheology is crucial for materials science and geology.
Purpose of the Study:
- To investigate the nanoscale structural drivers of mechanical behavior in silicate glasses across a compositional range.
- To quantify parameters like correlation length (ξ) and microscopic free volume (Vc) and their link to mechanical properties.
Main Methods:
- Characterization of synthetic silicate glass-forming melts using a granular-medium framework.
- Quantification of vibrational and physical properties to determine structural parameters.
- Analysis of compositional series from basalt to rhyolite.
Main Results:
- Both correlation length (ξ) and microscopic free volume (Vc) increase systematically with silica content.
- Higher ξ and Vc show strong inverse correlations with elastic moduli and melt fragility.
- Medium-range order variations significantly affect the elastic and viscous response of silicate melts.
Conclusions:
- Compositional changes in silicate glasses directly impact nanoscale structural heterogeneity.
- This heterogeneity quantitatively links to variations in elastic moduli and rheological behavior.
- Provides a framework for understanding the mechanical evolution of volcanic and technical glasses.
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