Rubidium peroxide

Rubidium peroxide is rubidium's peroxide with the chemical formula Rb2O2.

Production
Rubidium peroxide can be produced by rapidly oxidizing rubidium in liquid ammonia at −50°C.
 * $$\mathrm{2\ Rb + O_2 \ \xrightarrow{-50\;^\circ\text{C}}\ Rb_2O_2 }$$

It can also be produced by pyrolysis of rubidium superoxide in vacuum.
 * $$\mathrm{2\ RbO_2 \ \xrightarrow{290\;^\circ\text{C}}\ Rb_2O_2 + O_2}$$

Properties
Rubidium peroxide is a colourless to light yellow solid with the orthorhombic crystal structure.