PbBr2-PbCl2-PbF2-PbO-P2O5系统玻璃的热性质和化学稳定性

摘要

重点研究了PbBr2-PbCl2-PbF2-PbO-P2O5系统玻璃的热性质、耐水性和抗潮解性. 结果表明：该系统玻璃的热膨胀系数较大，一般在25×10-6°C-1左右. PbBr2-PbCl2-P2O5系统的玻璃具有较低的玻璃转变温度，可低达146°C. 加入PbF2和/或PbO可显著提高玻璃的转变温度和密度，其中PbO对试样的影响更为显著. PbBr2-PbCl2-PbF2-PbO-P2O5系统玻璃的抗潮解性一般较好. 多数玻璃在水中的溶解速率可达10-5mm/day, 具有较好的耐水性.%A series of new glasses in the PbBr2-PbCl2-PbF2-PbO-P2O5 system were prepared and some properties of the glasses in the PbBr2-PbCl2-PbF2-PbO-P2O5 system were studied. Their composition dependence of glass transition temperature(T g), thermal expansion coefficient and water durability was reported. Glasses in the PbBr2-PbCl2-P2O5 ternary system have relative low glass transition temperature(>146C). When PbO and/or PbF2 are introduced into the ternary system, the glass transition temperature increases considerably. Glasses containing PbO have higher transition temperature than those containing PbF2. The glasses in this system have relative high thermal expansion coefficient(25×10-6/C). Most of the glasses exhibit good water durability, and the dissolution rate in deionised water at 25C is in the order of 10-4～10-5mm/day. The introduction of PbO and/or PbF2 into the glasses does not change their water durability much. With the increase of P2O5, the water durability of the glass becomes bad obviously.