tetroxide

Antimonic oxide is converted on ignition into the tetroxide (Sb2O4) with loss of oxygen.

The residue is a white infusible powder, and consists of antimony tetroxide, Sb2O4, containing 78.94 per cent.

Trimanganese tetroxide, Mn3O4, is produced more or less pure when the other oxides are heated.

Osmium tetroxide (OsO4) is a very volatile liquid and is used under the name of osmic acid as a stain for sections in microscopy.

On strongly heating in air it is converted into the tetroxide.