Rubidium sesquioxide is a chemical compound with the formula Rb2O3 or more accurately Rb4O6.
In terms of oxidation states, Rubidium in this compound has a nominal charge of +1, and the oxygen is a mixed peroxide (O2−2) and superoxide (O−2) for a structural formula of (Rb+)4(O−2)2(O2−2).
[4] It has been studied theoretically as an example of a strongly correlated material.
[5] The compound was predicted to be a rare example of a ferromagnetic compound that is magnetic due to a p-block element,[6] and a half-metal that was conducting in the minority spin band.
[1][5] Rb4O6 also displays a Verwey transition where charge ordering appears at 290 K.[8] Rubidium sesquioxide can be prepared by reacting the peroxide Rb2O2 and the superoxide RbO2:[2] It is initially discovered in 1907,[9][3] and more thoroughly characterized in 1939.