What is it about?
Water is a key component of magmatic liquids, and it is present also in industrial glasses. Its solution mechanisms influence how water alters the atomic structure of glasses and their melts. Utimately, this drives important changes in the properties of melts (such as viscosity) and glasses (such as their density). Here, using various spectroscopic methods, we refine our knowledge of such solution mechanisms. Unique data acquired directly in melts at high temperature and high pressure further allow comparing water environment in melts and the corresponding glasses obtained by rapid quench.
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Why is it important?
Here we show that Raman spectroscopy can provide absolute, quantitative measures of the water environment in glasses. In situ data further stress the difference of the environment of water in glasses and in melts. The findings strengthen the idea that information about water environment in glasses is not very pertinent to understand processes happening in the melts at high temperature. Ultimately, this implies that most studies do not allow drawing a good picture of what happens at high temperature, for example in a degassing magma in a volcano.
Perspectives
This study was very exciting because, first, we present the first absolute determination of water speciation in glasses by Raman spectroscopy , and second, we also present unique data acquired in diamond anvil cells directly in calcium alumonosilicate melts, key compositions for geological and industrial problems.
Dr Charles Le Losq
Universite Sorbonne Paris Cite
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This page is a summary of: Water solution mechanism in calcium aluminosilicate glasses and melts: insights from in and ex situ Raman and 29 Si</mml:mt..., Comptes Rendus Géoscience, December 2022, Cellule MathDoc/CEDRAM,
DOI: 10.5802/crgeos.127.
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