Number of the records: 1
Effect of network connectivity on behavior of synthetic Broborg hillfort glasses
- 1.
SYSNO ASEP 0564416 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of network connectivity on behavior of synthetic Broborg hillfort glasses Author(s) Marcial, J. (US)
Cicconi, F. (IT)
Pearce, C.I. (US)
Kloužek, Jaroslav (USMH-B) RID, ORCID, SAI
Neeway, J.J. (US)
Pokorný, Richard (USMH-B) ORCID
Vernerová, Miroslava (USMH-B) RID, ORCID
McCloy, J. S. (US)
Nienhuis, E.T. (US)
Sjoblom, R. (SE)
Weaver, J.L. (US)
Hand, R.J. (GB)
Hrma, P. (US)
Neuville, D.R. (FR)
Kruger, A.A. (US)Number of authors 15 Source Title Journal of the American Ceramic Society. - : Wiley - ISSN 0002-7820
Roč. 106, č. 3 (2023), s. 1716-1731Number of pages 16 s. Language eng - English Country US - United States Keywords aluminosilicate glasses ; cultural heritage materials ; Fe ; glass durability ; glass redox Subject RIV JH - Ceramics, Fire-Resistant Materials and Glass OECD category Ceramics Method of publishing Limited access Institutional support USMH-B - RVO:67985891 UT WOS 000881946100001 EID SCOPUS 85142100359 DOI 10.1111/jace.18778 Annotation There is wide industrial interest in developing robust models of long-term (>100 years) glass durability. Archeological glass analogs, glasses of similar composition, and alteration conditions to those being tested for durability can be used to evaluate and inform such models. Two such analog glasses from a 1500-year-old vitrified hillfort near Uppsala, Sweden have previously been identified as potential analogs for low concentration Fe-bearing aluminosilicate nuclear waste glasses. However, open questions remain regarding the melting environment from which these historic glasses were formed and the effect of these conditions on their chemical durability. A key factor to answering the previous melting and durability questions is the redox state of Fe in the starting and final materials. Past work has shown that the melting conditions of a glass-forming melt may influence the redox ratio value (Fe+3/ n-ary sumation Fe), a measure of a glass's redox state, and both melting conditions and the redox ratio may influence the glass alteration behavior. Synthetic analogs of the hillfort glasses have been produced using either fully oxidized or reduced Fe precursors to address this question. In this study, the melting behavior, glass transition temperature, oxidation state, network structure, and chemical durability of these synthesized glass analogs is presented. Resulting data suggests that the degree of network connectivity as impacted by the oxidation state of iron impacted the behavior of the glass-forming melt but in this case does not affect the chemical durability of the final glass. Glasses with a lower degree of melt connectivity were found to have a lower viscosity, resulting in a lower glass transition temperature and softening temperature, as well as in a lower temperature of foam onset and temperature of foam maximum. This lower degree of network connectivity most likely played a more significant role in accelerating the conversion of batch chemicals into glass than the presence of water vapor in the furnace's atmosphere. Future work will focus on using the results from this work with outcomes from other aspects of this project to evaluate long-term glass alteration models. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2024 Electronic address https://doi.org/10.1111/jace.18778
Number of the records: 1