List of alkali metal oxides

The alkali metals react with oxygen to form several different compounds: suboxides, oxides, peroxides, sesquioxides, superoxides, and ozonides. They all react violently with water.

Alkali metal suboxides

Lithium oxide is the lightest alkali metal oxide and a white solid. It melts at 1570 °C.
Sodium oxide is a white solid that melts at 1132 °C and decomposes at 1950 °C. It is a component of glass.
Potassium oxide is a pale yellow solid that decomposes at 350 °C.
Rubidium oxide is a yellow solid that melts at 500 °C.
Caesium oxide is a yellow-orange solid that melts at 490 °C.

Lithium peroxide is a white solid that melts at 195 °C. It reacts with carbon dioxide to form lithium carbonate and oxygen.
Sodium peroxide is a pale yellow solid that melts at 460 °C and decomposes at 657 °C.
Potassium peroxide is a yellow solid that melts at 490 °C.
Rubidium peroxide is produced when rubidium stands in air.
Caesium peroxide is produced by the decomposition of caesium oxide above 400 °C.

Lithium superoxide has only been isolated in matrix isolation at 15 K.
Sodium superoxide is a yellow-orange solid that melts at 551.7 °C. It is made by the high-pressure oxidation of sodium peroxide.
Potassium superoxide is a yellow solid that decomposes at 560 °C. It is used as a CO₂ scrubber, H₂O dehumidifier, and O₂ generator in rebreathers, spacecraft, submarines, and spacesuit life support systems.
Rubidium superoxide is produced when rubidium burns in air.
Caesium superoxide is produced when caesium burns in air.

Lithium ozonide is a red solid which is produced from caesium ozonide via an ion-exchange process.
Sodium ozonide is a red solid which is produced from caesium ozonide via an ion-exchange process.
Potassium ozonide is a dark red solid which is produced when potassium is burned in ozone or exposed to air for years.
Rubidium ozonide is a dark red solid which is produced when rubidium is burned in ozone.
Caesium ozonide is a dark red solid which is produced when caesium is burned in ozone.