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Updated: Jul 12, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Effects of high temperature on silicate liquid structure: a multinuclear NMR study
High-temperature nuclear magnetic resonance (NMR) reveals how alkali aluminosilicate liquid structures change with heat. Increasing temperatures alter silicon and aluminum structures, impacting material properties for geochemists and glass scientists.
Area of Science:
- Geochemistry
- Geophysics
- Materials Science
- Solid-State Chemistry
Background:
- The structure of silicate liquids significantly influences their thermodynamic and transport properties.
- Accurate models for geochemists, geophysicists, and glass scientists require incorporating temperature-dependent structural changes.
Purpose of the Study:
- To investigate the time-averaged structure of alkali aluminosilicate liquids at high temperatures.
- To understand the effects of temperature on the local and intermediate-range structure of these liquids.
Main Methods:
- Utilized in situ, high-temperature nuclear magnetic resonance (NMR) spectroscopy.
- Analyzed spectra for sodium-23 (23Na), aluminum-27 (27Al), and silicon-29 (29Si) up to 1320 degrees C.
Main Results:
- Observed an increase in isotropic chemical shifts for 29Si with rising temperature, suggesting intermediate-range structural changes like bond expansion.
- Recorded a decrease in isotropic chemical shifts for 27Al, indicating short-range structural changes, including an increased coordination number.
- Identified the presence of a few percent six-coordinated aluminum in the sodium aluminosilicate liquid at high temperatures.
Conclusions:
- Temperature exerts a significant influence on the structural arrangements within alkali aluminosilicate liquids.
- NMR spectroscopy provides crucial insights into the temperature-dependent structural evolution of these materials.
- The findings are vital for refining models used in geochemistry, geophysics, and glass science.
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