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Updated: Jun 13, 2026

$Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction$

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction

Published on: May 20, 2018

High-energy X-ray diffraction from aluminosilicate liquids.

M C Wilding¹, C J Benmore, J K R Weber

¹Institute of Mathematical and Physical Sciences, Aberystwyth University, Aberystwyth, Ceredigion SY23 3BZ, UK.

The Journal of Physical Chemistry. B

|April 16, 2010

Summary

This summary is machine-generated.

Adding alumina to molten silica distorts structural units and disrupts order. Higher alumina content in aluminum oxide-silicon dioxide melts leads to disordered polyhedra and lower viscosity, indicating temperature-dependent structural changes.

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Area of Science:

Materials Science
Geochemistry
Physical Chemistry

Background:

Molten aluminum oxide-silicon dioxide (Al(2)O(3)-SiO(2)) systems are crucial in various industrial applications.
Understanding their liquid structure is key to predicting material properties like viscosity.

Purpose of the Study:

To investigate the structural evolution of molten Al(2)O(3)-SiO(2) with varying compositions.
To correlate structural changes with melt properties such as viscosity.

Main Methods:

Containerless high-energy X-ray diffraction was employed to study molten Al(2)O(3)-SiO(2) across a range of compositions.
X-ray pair distribution functions were analyzed to determine structural arrangements.

Main Results:

Alumina addition caused significant distortion of SiO(4) tetrahedra and breakdown of intermediate-range order.
Silica-rich melts showed 4-fold oxygen triclusters, correlating with high viscosity.
Alumina-rich melts exhibited increasing cation-oxygen coordination and disordered AlO(n) polyhedra (n=4,5,6), associated with low viscosity.
Liquid and glassy states at the mullite composition showed significant polyhedral distortion, indicating temperature-dependent structural changes.

Conclusions:

The structure of molten Al(2)O(3)-SiO(2) is highly sensitive to composition, influencing melt viscosity.
Disordered AlO(n) polyhedra play a critical role in the low viscosity of alumina-rich melts.
Temperature significantly impacts the structural arrangement of polyhedra in these melts.