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Water as a dense icelike component in silicate glasses
1P. Richet, Laboratoire de Physique des Geomateriaux, Unite de Recherche Associee CNRS 734, Institut de Physique du Globe, 4, Place Jussieu, 75252 Paris Cedex 05, France. A. Polian, Laboratoire de Physique des Milieux Condenses, Unite de.
Science (New York, N.Y.)
|July 17, 1998
Summary
Dissolved water in andesite glass, whether hydroxyl ions or molecular, has properties similar to dense ice VII. This indicates hydrogen bonding drives dissolution, not volume changes, and high water content decreases shear modulus.
Area of Science:
- Geochemistry
- Materials Science
- Mineral Physics
Background:
- Understanding water's behavior in geological materials is crucial for interpreting Earth's processes.
- The dissolution mechanism and physical effects of water in silicate glasses are not fully understood.
- Andesite glass serves as a model system for studying magma properties.
Purpose of the Study:
- To investigate the physical properties of dissolved water in andesite glass.
- To determine the partial molar volume and bulk modulus of water in andesite glass.
- To explore the relationship between water speciation, hydrogen bonding, and glass properties.
Main Methods:
- Density measurements at ambient conditions.
- Brillouin-scattering spectroscopy to probe acoustic properties.
- Analysis of water speciation (hydroxyl vs. molecular) within the glass structure.
Main Results:
- Dissolved water exhibits a concentration-independent partial molar volume of 12 ± 0.5 cm³/mol.
- The bulk modulus of dissolved water is 18 ± 3 GPa, comparable to ice VII.
- Water speciation is governed by entropy, not system volume, with significant shear modulus reduction above 1 wt% water.
Conclusions:
- Hydrogen bonding is a key factor in water dissolution in andesite glass.
- Water's behavior in glass is analogous to that of ice VII, suggesting similar structural ordering.
- High water concentrations significantly weaken the mechanical integrity of silicate glasses.
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