Effects of BaO on the glass formation of the PbO-B2O3-TiO2-BaO system in relation to transition temperatures

摘要

The variation of the BaO content on the quaternary PbO-B2O3-TiO2-BaO system's glass formation tendency was investigated in relation to transition temperatures, such as melt temperature (T f), liquidus temperature (T l), crystallization temperature (T c) and glass transition temperature (T g). Compositions were melted between 800°C and 1300°C. In order to obtain bulk glass samples, glass formation was carried out using a preheated cylindrical brass mould without forcing the cooling rate to increase. Glass formation tendency increased with increasing the temperature ratios of T g/T l and T c/T l and with decreasing T g/T c. Eutectic compositions preferentially formed glasses from melts due to their low melting temperatures.