Low frequency vibrational dynamics and polyamorphism in Y2O3-Al2O3 glasses

WILDING, Martin, WILSON, Mark, MCMILLAN, Paul F., DESCHAMPS, Thierry and CHAMPAGNON, Bernard (2014). Low frequency vibrational dynamics and polyamorphism in Y2O3-Al2O3 glasses. Physical Chemistry Chemical Physics, 16 (40), 22083-22096.

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Abstract

Glass formation, and associated potential polyamorphism are investigated for the key ceramic Y2O3–Al2O3 using a combination of experimental and theoretical techniques. Liquid samples are rapidly cooled by drop quenching and high and low density amorphous regions (LDA and HDA respectively) are identified using reflected light microscopy. Raman spectra are obtained to low frequency focussed on regions identified as pure LDA or HDA. The respective compositions of these regions are confirmed by electron microprobe analysis. These spectra are used to extract the vibrational densities of states and these are compared with those generated for the liquid oxide using polarizable-ion molecular dynamics simulations. The experimental and simulated spectra are used to determine the low temperature heat capacities. The low frequency regions of the spectra display an excess of states (boson peaks) which are different for the two glasses. Thermodynamic modelling is used to demonstrate how samples of the same composition my vitrify or not depending upon the quench rate.

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/10.1039/C4CP02163K
Page Range:	22083-22096
Depositing User:	Martin Wilding
Date Deposited:	07 Jun 2018 14:42
Last Modified:	18 Mar 2021 12:17
URI:	https://shura.shu.ac.uk/id/eprint/21469

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