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Dehydration of rhyolite: activation energy, water speciation and morphological investigation

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Abstract

Rhyolite is an extrusive, igneous rock of aluminosilicate composition that upon rapid cooling forms obsidian. Obsidian is amorphous and contains limited water portions (< 2 mass%); however, secondary hydration turns it either to perlite (H2O ≈ 2–5 mass%) or pitchstone (> 5 mass%). In the current study, kinetics of hydrous rhyolite dehydration were investigated by thermogravimetry up to 1000 °C, at heating rates of 2.5, 5, 10 and 20 °C min−1 and under inert atmosphere. The mass loss is approx. 7.6 mass%, occurs along wide temperature range (100–800 °C) and is solely attributed to the release of molecular water ((H2O)m) and hydroxyl groups (OH). Rhyolite dehydration was considered as a solid-state reaction, and the apparent activation energy (Ea) of dehydration was calculated throughout the whole conversion range (a) by applying the isoconversional Friedman and advanced Vyazovkin methods. Both methods revealed inverse sigmoid trend in Ea values versus conversion degree, possessing almost stable value of 61 ± 5 kJ mol−1 for Friedman method and 59.44 kJ mol−1 for Vyazovkin method on conversion range between 0.25 and 0.75, and sharp increase at higher conversion degree. The intensive change in Ea during dehydration progression is attributed to the change in releasing species (from (H2O)m to OH). Raman and FT-IR spectroscopy analyses of raw and partially dehydrated samples at different stages revealed that up to 300 °C mainly (H2O)m is diffused out of the material causing sample enrichment in OH groups. OH release, which occurs at relatively higher temperature, is accompanied by increase in apparent Ea value of dehydration. Concerning microstructure of raw rhyolite, it exhibits a network of micro-fractures which serve as water release routes. Upon heating, more and wider fractures are created. At 600 °C, fractures merging occurs creating voids, which constitute forerunners of the expansion phenomenon. Further temperature increase causes material softening allowing local plastic deformation, which under the high pressure that is exerted by the releasing water species incites the formation of large cavities and fractures, initiating expansion.

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Authors and Affiliations

  1. Laboratory of Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St, 15780, Athens, Greece

    Panagiotis M. Angelopoulos & Maria Taxiarchou

  2. Fuel and Combustion Laboratory, Faculty of Mechanical Engineering, University of Belgrade, 16 Kraljice Marije St, P.O. Box 35, Belgrade, 11120, Serbia

    Nebojša Manić

  3. Laboratory of Physical Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Heroon Polytechniou St, 15780, Athens, Greece

    Petros Tsakiridis

  4. Department of Physical Chemistry, Institute of Nuclear Sciences “Vinca”, University of Belgrade, 12-14 Mike Petrovica Alasa St, P.O. Box 522, Belgrade, 11001, Serbia

    Bojan Janković

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  1. Panagiotis M. Angelopoulos
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Angelopoulos, P.M., Manić, N., Tsakiridis, P. et al. Dehydration of rhyolite: activation energy, water speciation and morphological investigation. J Therm Anal Calorim 142, 395–407 (2020). https://doi.org/10.1007/s10973-020-10105-2

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