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Thermodynamic insight into the evolution of medieval glassworking properties
Author(s) -
Hunault Myrtille O. J. Y.,
Vinel Vincent,
Cormier Laurent,
Calas Georges
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14819
Subject(s) - differential scanning calorimetry , thermodynamics , viscosity , mineralogy , glass transition , crystallization , potash , materials science , lime , glass recycling , chemistry , metallurgy , composite material , polymer , potassium , physics
We present differential scanning calorimetry ( DSC ) analyses of seven French stained glasses from the 13th to 16th centuries. These glasses illustrate the dramatic compositional change from the antique soda‐rich glasses to potash‐ and lime‐rich compositions, resulting in drastic temperature and viscosity increases. We investigate the influence of chemical composition on glass thermal properties: glass‐transition ( T g ), crystallization, and melting temperatures. We find that T g varies from 533°C (soda type) to 638°C±17°C (potash type) to 685°C±5°C (lime type). The viscous slowdown of the melt as a function of the temperature, close to T g , was modeled using the Vogel‐Tammann‐Fulcher equation. This enables temperature‐viscosity profile calculations, and suggests that recipes have been empirically optimized to reach similar thermoelastic properties suitable for glassmaking despite changing the nature of raw materials.