What is "lithium oxide"

n. (context chemistry English) a white, powdered alkali, Li₂O, used in the manufacture of glass and ceramics

Lithium oxide ( O) or lithia is an inorganic chemical compound. Lithium oxide is formed along with small amounts of lithium peroxide when lithium metal is burned in the air and combines with oxygen:

Pure can be produced by the thermal decomposition of lithium peroxide, , at 450 °C