Lanthanum oxysulfide

Lanthanum oxysulfide is an inorganic compound, a salt of lanthanum and hydrogen sulfide acid, with the formula.

Synthesis

Calcination of lanthanum(III) sulfate in oxygen current at 750 °C:
The resulting product is reduced with hydrogen when heated:

Physical properties

The compound forms yellowish-white hexagonal crystals.

Uses

The compound is used as a laser host material.