Barium peroxide, with the chemical formula BaO2, is a chemical compound composed of barium (Ba) cations and peroxide (O2^2-) anions. It is a white or yellowish powder that is sparingly soluble in water.

Some key properties and uses of barium peroxide include:

1. Oxygen Source: Barium peroxide is a powerful source of oxygen. When heated or exposed to water, it decomposes to release oxygen gas (O2). This property makes it useful in certain oxygen-generating systems.
2. Rocket Propellant: Barium peroxide has been used as an oxidizer in certain rocket propellants due to its ability to release oxygen when heated.
3. Pyrotechnics: It is used in certain pyrotechnic compositions to produce a bright flash of light and generate oxygen for combustion.
4. Bleaching Agent: Barium peroxide has been used as a bleaching agent in some applications, although its use has been largely replaced by other, safer alternatives.

Barium peroxide is highly reactive and should be handled with extreme care. It is considered an oxidizing agent and can react vigorously with reducing agents and combustible materials, leading to fire or explosion.

Due to its reactivity and potential hazards, the use of barium peroxide is limited to specialized industrial and pyrotechnic applications where its unique properties are required. It is not commonly encountered in everyday use, and proper safety precautions should be followed when working with this compound to avoid accidents and ensure the safety of researchers and lab personnel.