The influence of the introduction of ZrO2 up to 5 mol% into a 30K2O-70SiO2 base glass composition has been investigated with the aid of differential thermal analysis (DTA), FT-IR spectroscopy, as well as chemical durability tests (pH, conductivity and AES-Inductively Coupled Plasma measurements) and refraction index determination. Several differences have been carried out by comparison with similar compositions belonging to the Li2O-ZrO2-SiO2 system. The higher ionic radius and the lower field strength of K+ with respect to Li+ are responsible for higher stability towards crystallisation and lower chemical durability. Moreover, even though Zr4+ increases glass polymerisation (higher glass transition temperature, chemical durability and refraction index), the presence of high water content as highlighted by spectroscopy measurements, seams to weaken glass structure.
GLASS FORMATION AND DEVITRIFICATION IN THE K2O-ZRO2-SIO2 SYSTEM / Barbieri, Luisa; Lancellotti, Isabella; Leonelli, Cristina; Pellacani, Gian Carlo; Siligardi, Cristina. - In: PHYSICS AND CHEMISTRY OF GLASSES. - ISSN 0031-9090. - STAMPA. - 43C:(2002), pp. 462-464.
GLASS FORMATION AND DEVITRIFICATION IN THE K2O-ZRO2-SIO2 SYSTEM
BARBIERI, Luisa;LANCELLOTTI, Isabella;LEONELLI, Cristina;PELLACANI, Gian Carlo;SILIGARDI, Cristina
2002
Abstract
The influence of the introduction of ZrO2 up to 5 mol% into a 30K2O-70SiO2 base glass composition has been investigated with the aid of differential thermal analysis (DTA), FT-IR spectroscopy, as well as chemical durability tests (pH, conductivity and AES-Inductively Coupled Plasma measurements) and refraction index determination. Several differences have been carried out by comparison with similar compositions belonging to the Li2O-ZrO2-SiO2 system. The higher ionic radius and the lower field strength of K+ with respect to Li+ are responsible for higher stability towards crystallisation and lower chemical durability. Moreover, even though Zr4+ increases glass polymerisation (higher glass transition temperature, chemical durability and refraction index), the presence of high water content as highlighted by spectroscopy measurements, seams to weaken glass structure.
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