Low frequency vibrational dynamics and polyamorphism in Y2O3–Al2O3 glasses
Literature Information
Martin C. Wilding, Mark Wilson, Paul F. McMillan, Thierry Deschamps, Bernard Champagnon
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.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.












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