XRD and micro-Raman study of structural transformations in (B2O3)_{1-x}(H2O)_x glasses and liquids

Ralf Bruning; Justine B. Galbraith; Katherine E. Braedley; Jonathan Johnstone; Jaqcues Robichaud; Subramanian Balaji; Yahia Djaoued

arXiv · 0911.4049

XRD and micro-Raman study of structural transformations in (B2O3)_{1-x}(H2O)_x glasses and liquids

Ralf Bruning·Justine B. Galbraith·Katherine E. Braedley·Jonathan Johnstone·Jaqcues Robichaud·Subramanian Balaji·Yahia Djaoued

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Abstract

Liquid water and vitreous B$_2$O$_3$ are the endpoints of a continuous range of random networks in which hydrogen bonds gradually replace covalent bonds. Previous work has shown that glasses can be obtained by quenching in the range $x \le$ 0.50. We report the wide-angle x-ray scattering by the liquid phase in the composition range from $x$ = 0.38 to $x$ = 1.00 (pure water) at temperatures just above the liquidus. The first sharp diffraction peak (FSDP) remains at an approximately constant position in the range from $0 \le x \le 0.8$. Beyond this range, the position of the FSDP shifts linearly to higher angles. The relative concentration of the molecular species in the glasses and melts were measured with micro-Raman spectroscopy. Small molecular species are found for glasses and liquids with $x > 0.36$, determining the critical point at which the sample ceases to be a single macromolecule. Molecular water is present in liquids with $x > 0.62$.

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Ralf Bruning, Justine B. Galbraith, Katherine E. Braedley, Jonathan Johnstone, Jaqcues Robichaud, Subramanian Balaji, Yahia Djaoued. 2009-11-20. XRD and micro-Raman study of structural transformations in (B2O3)_{1-x}(H2O)_x glasses and liquids. https://arxiv.org/abs/0911.4049

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