Effect of adding Ag2O to vanadium-containing low-melting glass for low-temperature sealing

Achieving both high water durability and low glass transition temperature is crucial for the practical use of low-melting glass in hermetic sealing. In Ag2O–V2O5–TeO2 glass, we found that the increase in Ag2O content lowers glass transition temperature and improves water durability. Furthermore, the reason for the improvement of water durability is considered to be due to the increase in the coordination number of oxygen atoms around vanadium ions without the change in oxidation state, as shown by X-ray absorption fine structure measurements. We demonstrate that a Ag2O–V2O5–TeO2 glass is a key glass system for low-temperature hermetic sealing.