NaO

Sodium oxide (Na₂O) is an ionic ceramic compound and a basic oxide that serves primarily as a flux and network modifier in glass and ceramic formulations rather than as a structural material in its pure form. In industrial practice, it is encountered most commonly as a constituent of soda-lime-silica glasses, glazes, and ceramic bodies, where it lowers melting temperatures and improves workability; it is seldom used as an engineered solid on its own due to its hygroscopic nature and chemical reactivity. Engineers select sodium oxide as a glass/ceramic additive to reduce processing costs and temperatures, though its presence must be carefully controlled to avoid degrading mechanical properties or chemical durability depending on the application.