Ceramics-Silikáty 43 (2) 56-60 (1999)

LOW-MELTING GLASSES DERIVED FROM THE PbO-B₂O₃-SiO₂ SYSTEM BY SUBSTITUTING ZnO FOR THE BASIC OXIDES

N. S. Blagojevic, V. D. Zivanovic

The paper deals with the preparation and characterization of low-melting glasses derived from the PbO-B₂O₃-SiO₂ system by substituting ZnO for SiO₂ or PbO in the basic system. The basic system for the investigation was glass of the composition: 40 PbO, 34 B₂O₃, 26 SiO₂ (mol.%). Structural characteristics of the synthesized glasses were investigated by infrared spectroscopy. In addition, density, thermal expansion, crystallization ability and hydrolytic durability of the glasses were determined. The results show that the substitution of ZnO for PbO or SiO₂ in the base PbO-B₂O₃-SiO₂ system strongly affects all glass properties. The investigated glasses show a small tendency to crystallize, exhibit a good hydrolytic durability and the thermal expansion coefficients in the range α = (30 - 100) ´ 10^-7 K^-1.

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