Melting Process and Viscosity of Bohemian Historical Glasses Studied on Model Glasses

Pánová, Karolína; Jílková, Kristýna; Rohanová, Dana; Lahodný, František; Galusková, Dagmar; Míka, M.

doi:10.3390/min11080829

Cited by 2 publications

(2 citation statements)

References 13 publications

(24 reference statements)

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“…The glass served as a cheaper imitation of jade, for its dark green colour, and only to a limited extent as household glassware, because of its low resistance to thermal shock [52,53]. However, the origin of Ba-rich slags in intentional glass production seems in the light of the archaeological context, together with the long-term tradition of wood ash lime glass production within Europe (uniform composition since the 13th century), to be questionable at least [54][55][56].…”

Section: Origin Of Barium-rich Slagsmentioning

confidence: 99%

Origin of Historical Ba-Rich Slags Related to Pb-Ag Production from Jihlava Ore District (Czech Republic)

et al. 2022

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The aim of this study was to characterize historical slags which originated during silver production from the Jihlava ore district, Czech Republic. The area was among the head producers of silver within the Lands of the Czech Crown in 13th–14th centuries. The mined ores had complex composition, being formed mostly by pyrite, sphalerite, galena, chalcopyrite, and accessory silver-rich minerals such as silver-bearing tetrahedrite (freibergite) or pyrargyrite, with gangue represented by quartz and Mn-rich carbonates or baryte. Large volumes of slags with contrasting composition were generated during the Pb-Ag production. Altogether, two main types of slags were identified in the district. The first type is characterized by high BaO contents (up to 34.5 wt.%) and dominancy of glass, minor quartz, and accessory amounts of Ba-rich feldspar (up to 93 mol.% of Cls), metal-rich inclusions, Ba-Pb sulphates and only rare pyroxene, wollastonite and melilite. The composition of the second group belongs to fayalitic slags containing glass, Fe-rich olivine, accessory pyroxene, feldspar, quartz, and inclusions of various metallic phases. Fluxes were derived from gangue (quartz, carbonates, baryte) or local host rocks for both types of slag. The calculated viscosity indexes reflect (with minor exceptions) medium-to-high effectivity of metal separation. Smelting temperatures were estimated from a series of ternary plots; however, more reliable estimates for both types of slags were obtained only from experimental determination of melting temperature and calculations using bulk/glass compositions (~1100–1200 °C).

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Section: Origin Of Barium-rich Slagsmentioning

confidence: 99%

Origin of Historical Ba-Rich Slags Related to Pb-Ag Production from Jihlava Ore District (Czech Republic)

et al. 2022

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“… Heredia-Langner et al (2022) presented a model based on 3,935 viscosity-temperature data for 574 types of glass, aiming to predict the melting of alkaline-aluminum-viscous borosilicate glasses as a function of composition and temperature. Panova et al (2021) described the three main types of Bohemian historical glass melting processes, illustrating the complexity of historical glass melting, as well as technological advances between periods. Liu et al (2019) summarized the glass compositional system and production process of glass bead ornaments unearthed from the Han tombs in Lingnan and explored the provenance sources of the glass bead ornaments based on the chemical compositions and the style of the vessels.…”

Section: Literature Reviewmentioning

confidence: 99%

Prediction and classification of chemical composition of ancient glass objects based on generalized Shapley functions

Cai,

Yin,

Han

2024

Front. Chem.

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Ancient glass products have suffered from the baptism of time and experienced changes in the burial environment and weathering, resulting in a change in the proportions of their chemical composition and interfering with their accurate identification by later generations. In this paper, the chemical composition of ancient glass products is predicted and identified. First, the multivariate statistical ANOVA test is applied to explore the relationship between whether the cultural relics samples are weathered or not and the glass type, decoration, and color to derive a law of chemical composition of the cultural relics and to analyze the correlation and difference among the four factors. Second, compared with the relevant data of the existing glass products, the missing values are processed by using the method of filling in the plurality. The weathering condition of the sampling points of the samples whose surfaces are not weathered is judged by the “distance discrimination method.” Combined with the characteristics of the lead-barium glass and the high-potassium glass, the law of the chemical composition content on the surface of the samples, weathered or not, is explored. The modeling of the gray prediction method was applied again to predict the chemical composition content before weathering. Finally, the generalized Shapley function of fuzzy measurement was used to analyze the correlation between indicators and the chemical compositions and their differences. The scheme proposed in this paper can solve the difficult problem of category judgment in archeology, which is of great significance in promoting the smooth progress of archaeological work.

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Melting Process and Viscosity of Bohemian Historical Glasses Studied on Model Glasses

Cited by 2 publications

References 13 publications

Origin of Historical Ba-Rich Slags Related to Pb-Ag Production from Jihlava Ore District (Czech Republic)

Origin of Historical Ba-Rich Slags Related to Pb-Ag Production from Jihlava Ore District (Czech Republic)

Prediction and classification of chemical composition of ancient glass objects based on generalized Shapley functions

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