strontiumoxide

Strontium oxide, SrO, is an inorganic compound composed of strontium ions Sr2+ and oxide ions O2-. It is a white, highly hygroscopic solid that rapidly picks up moisture from the air and forms strontium hydroxide, Sr(OH)2. It adopts a cubic rock‑salt crystal structure and has a high melting point.

Industrially, SrO is produced by calcination of strontium carbonate: SrCO3 → SrO + CO2 at temperatures around 1000 °C. It can also be derived from other strontium compounds. In air, SrO slowly converts to SrCO3 due to reaction with CO2.

SrO is a basic oxide. It reacts vigorously with water to give Sr(OH)2 and heat: SrO + H2O → Sr(OH)2. It also reacts with acids to form soluble strontium salts (for example SrO + 2 HCl → SrCl2 + H2O). Reaction with CO2 yields strontium carbonate: SrO + CO2 → SrCO3.

Applications include use in the production of glass and ceramic materials as a flux and colorant source for strontium compounds, as well as a laboratory reagent for preparing strontium salts. SrO is sometimes used as a drying agent in chemical processes due to its moisture-absorbing properties, though its handling requires care because of its caustic nature.

Safety: Strontium oxide is caustic and reacts with moisture and acids, releasing heat and potentially irritating or burning skin and eyes. It should be stored in a dry, tightly closed container and handled with appropriate personal protective equipment, in a well-ventilated area, away from water and acids.