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Poster communications

Effect of secondary phases on the evolution of glass alteration

Lucile Gentaz 1 T. Lombardo 1 Anne Chabas 1 C. Loisel 2 Delphine Neff 3, 4 D. Rebiscoul 5
2 LRMH - Laboratoire de recherche des monuments historiques
CRC - Centre de Recherche sur la Conservation
3 LAPA - UMR 3685 - Laboratoire Archéomatériaux et Prévision de l'Altération
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
4 IRAMAT - LMC - IRAMAT - Laboratoire Métallurgies et Cultures
IRAMAT - Institut de Recherches sur les Archéomatériaux
5 LNER - Nanomatériaux pour l'Energie et le Recyclage
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
Abstract : Whatever the environment (soils, water and atmosphere), glass of varying compositions undergo alteration process conditioned by exposure conditions and glass intrinsic chemical and physical properties. Modification varies from a simple loss of transparency to a severe material loss but always involve modifications of the structure and chemical composition at the interface between the glass and the environment (hydration, dealkalinisation, dissolution,…). In many cases, these alteration of the glass structure are associated to the conjointed precipitation of secondary phases outside of the glass network often in cracks and fractures or directly on the glass outer surface. On site and laboratory alteration were both carried out for two very different environent : atmospheric and burial conditions. In the case of atmospheric alteration analogues and original stained glasses were compared in order to study the early and long-term evolution of the glass weathering. The samples observed in the two types of site show comparable alteration patterns. The nature of the precipitates outlines the impact of specific environmental conditions but, in every exposure conditions, similarities can be drawn on the secondary phases retroactive impact on the glass alteration processes. Nano-scale chemical characterization of the various phases was carried out through SEM-EDX, TEM-EDX; mineralogical characterization through electron diffraction, and STXM (for the structural environment of Si and Fe). From those observation some comparison of the phases influence on the system evolution and glass alteration can be made. Often, the precipitations are located within cracks inside the glass object. In some cases the precipitates have a clogging effect and can even trap glass-borne elements released from further alteration, but more often than not, local dissolution/precipitation of these secondary minerals inside the network favours the widening of the fractures, which facilitate fluid circulation, hence triggering further glass dissolution (congruent and selective) and precipitation of other secondary phases.
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Poster communications
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https://hal-cea.archives-ouvertes.fr/cea-02341332
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Submitted on : Thursday, October 31, 2019 - 12:33:34 PM
Last modification on : Thursday, July 30, 2020 - 3:11:29 AM
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  • HAL Id : cea-02341332, version 1

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Lucile Gentaz, T. Lombardo, Anne Chabas, C. Loisel, Delphine Neff, et al.. Effect of secondary phases on the evolution of glass alteration. Goldschmidt 2017, Aug 2017, Paris, France. ⟨cea-02341332⟩

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