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X‐Ray Diffraction and Micro‐Raman Study of Structural Transformations in (B 2 O 3 ) 1−x (H 2 O) x Glasses and Liquids
Author(s) -
Brüning Ralf,
Galbraith Justine B.,
Braedley Katherine E.,
Johnstone Jonathan,
Robichaud Jacques,
Balaji Subramanian,
Djaoued Yahia
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03921.x
Subject(s) - raman spectroscopy , diffraction , crystallography , x ray crystallography , quenching (fluorescence) , liquidus , materials science , analytical chemistry (journal) , covalent bond , molecular geometry , chemistry , phase (matter) , molecule , optics , physics , fluorescence , organic chemistry , chromatography
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 ≤0.50. We report the wide‐angle X‐ray scattering by the liquid phase in the composition range from x =0.38 to 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 0≤ x ≤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.