Effect of preparation temperature on the characteristics of PbO-B₂O₃-SiO₂ glass powders with spherical shape

PbO-B₂O₃-SiO₂ powders were prepared using spray pyrolysis at different preparation temperatures. The characteristics of these glass powders were strongly affected by the preparation temperatures. The powders prepared at temperatures below 650 °C had non-spherical shapes, irregular morphologies, and aggregation between powders. One powder with a spherical shape and a dense morphology was obtained from one droplet at preparation temperatures between 700 and 1250 °C. Some of the powders evaporated at preparation temperatures above 1300 °C. The glass phase was formed during the spray pyrolysis even within a short residence time of the powders inside a hot wall reactor at a temperature of above 800 °C. Dielectric layers with clean surfaces and dense structures were achieved from the powders obtained at preparation temperatures above 600 °C. The dielectric layers formed from the powders prepared using spray pyrolysis at preparation temperatures above 600 °C had high similar transparencies regardless of their preparation temperatures.