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Updated: Jun 28, 2025
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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Dispersion, ionic bonding and vibrational shifts in phospho-aluminosilicate glasses
Thilo Grammes1, Dominique de Ligny2, Dintu Mathew1
1Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Lessingstr. 12 (AWZ), 07743 Jena, Germany. delia.brauer@uni-jena.de.
Physical Chemistry Chemical Physics : PCCP
|April 24, 2024
Summary
Phosphate incorporation into aluminosilicate glasses lowers refractive index and ionic bonding. These changes correlate with structural shifts and can be predicted using established models for simple oxide glasses.
Area of Science:
- Materials Science
- Geochemistry
- Solid State Chemistry
Background:
- Aluminosilicate glasses are crucial in magmatic studies and industrial applications.
- Tailoring glass properties, such as refractive index and ionic bonding, is achieved through elemental incorporation.
Purpose of the Study:
- Investigate the impact of phosphate (P2O5) on the refractive index and ionic bonding of aluminosilicate glasses.
- Analyze the structural changes and bonding characteristics in SiO2-Al2O3-Na2O-P2O5 glass systems.
Main Methods:
- Synthesized glasses in the SiO2-Al2O3-Na2O-P2O5 system with varying SiO2 and P2O5 content.
- Measured refractive index across visible to near-infrared wavelengths.
- Assessed ionic bonding using optical basicity and oxygen polarisability.
- Analyzed structural changes via infrared and Raman spectroscopy.
Main Results:
- Refractive index decreased with increasing P2O5 and SiO2 content, correlating with reduced density.
- The degree of ionic bonding, indicated by optical basicity and oxygen polarisability, decreased with higher P2O5 and SiO2.
- Observed band shifts in spectra indicated altered average bond strength, correlating linearly with optical basicity.
Conclusions:
- Phosphate incorporation significantly influences the optical and bonding properties of aluminosilicate glasses.
- Optical basicity and oxygen polarisability in these complex glasses adhere to empirical models developed for simpler systems.
- Structural and bonding changes are linked to the formation of Al-O-P bonds and network modifications.
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