Thorium oxyfluoride

Thorium oxyfluoride is an inorganic compound of thorium metal, fluorine, and oxygen with the chemical formula.

Synthesis

Thorium oxyfluoride can be prepared from partial hydrolysis of thorium tetrafluoride in moist air at elevated temperatures, about 1000 °C.
Reaction of thorium tetrafluoride with thorium dioxide at 600 °C:

Physical properties

The compound forms a white, insoluble amorphous powder.

Uses

The compound is used as a protective coating on reflective surfaces.