Examples from the Web for tetroxide
Antimonic oxide is converted on ignition into the tetroxide (Sb2O4) with loss of oxygen.A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer
It is a pale yellow powder (of specific gravity 6.5), which on being heated strongly gives up oxygen and forms the tetroxide.
It is given off as tetroxide when the alkaline solution which contains it is boiled.Cooley's Practical Receipts, Volume II|Arnold Cooley
On strongly heating in air it is converted into the tetroxide.