Characteristics of nano-sized pb-based glass powders by high temperature spray pyrolysis method

• Published in: Journal of the Ceramic Society of Japan 2008, Vol.116(1353), pp.600-604
• Main Authors: CHO, Jung Sang, JUNG, Dae Soo, HONG, Seung Kwon, KANG, Yun Chan
• Format: Article
• Language: English
• Subjects: Chemical vapor deposition; Dielectric material; Flame spray pyrolysis; Glass; Glass powder; Nanocomposites; Nanomaterials; Nanostructure; Sintering (powder metallurgy); Size distribution; Spray pyrolysis
• ISSN: 1882-0743; 1348-6535; 1348-6535
• DOI: 10.2109/jcersj2.116.600

In this study, nano-sized PbO-B2O3-SiO2 glass powders were directly prepared by high temperature flame spray pyrolysis. Glass powders prepared at a low flow rate of fuel gas had bimodal size distributions of nano-sized and submicron-sized powders. However, nano-sized glass powders with a narrow size distribution were prepared via a chemical vapor deposition (CVD) process at a high flow rate of fuel gas as 4.5 L/min. The mean size of the glass powders formed by the CVD process was 38 nm. Nano-sized glass powders were found to have high transmittances above 83% at sintering temperatures between 480 and 520°C. On the other hand, transmittances of the dielectric layers formed from the glass powders with bimodal size distributions of nano- and submicron-sized powders decreased with a decrease of sintering temperatures. The dielectric layers formed from the nano-sized glass powders had a dense structure with no porous areas inside the layer at low sintering temperatures.