High-Energy X-ray Diffraction from Aluminosilicate Liquids

WILDING, Martin, BENMORE, C. J. and WEBER, J. K. R. (2010). High-Energy X-ray Diffraction from Aluminosilicate Liquids. Journal of Physical Chemistry B, 114 (17), 5742-5746.

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Official URL: https://pubs.acs.org/doi/abs/10.1021/jp907587e
Link to published version:: https://doi.org/10.1021/jp907587e


Containerless high energy X-ray diffraction measurements have been performed on molten Al2O3−SiO2 as a function of composition. The data show a strong distortion of the SiO4 tetrahedral units and a breakdown of intermediate range order as alumina is added. For silica-rich compositions, the X-ray pair distribution functions are consistent with the presence of 4-fold oxygen triclusters predicted by molecular dynamics simulations, where these liquids exhibit relatively high viscosities compared to other binary silicates. For higher alumina content liquids, the average cation−oxygen coordination number gradually increases with increasing Al2O3 content, but the pair distribution functions change very little with composition, suggesting the increased presence of disordered AlOn (n = 4,5,6) polyhedra are associated with low viscosity melts. A comparison of the liquid and glassy X-ray pair distributions functions at the alumina-rich mullite composition indicate a significant distortion of the polyhedra in the melt, suggesting structural changes are temperature dependent.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Engineering Research
Departments - Does NOT include content added after October 2018: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
Identification Number: https://doi.org/10.1021/jp907587e
Page Range: 5742-5746
Depositing User: Martin Wilding
Date Deposited: 03 Jul 2018 14:56
Last Modified: 18 Mar 2021 11:45
URI: https://shura.shu.ac.uk/id/eprint/21487

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