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Lanthanum oxysulfide

Names
Other names lanthanum(3+); oxygen(2-); sulfide, lanthanum oxide sulfide, dilanthanum dioxide sulphide
Identifiers
CAS Number	13825-07-5
3D model (JSmol)	Interactive image
ECHA InfoCard	100.031.578
EC Number	234-750-7
PubChem CID	9949910
CompTox Dashboard (EPA)	601014208
InChI InChI=1S/2La.2O.S/q2*+3;3*-2Key: BZXKASZNANQGJD-UHFFFAOYSA-N
SMILES ....
Properties
Chemical formula	La 2O 2S
Molar mass	341.88 g/mol
Appearance	yellowish-white crystals
Density	5.77 g/cm
Related compounds
Related compounds	Gadolinium oxysulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Lanthanum oxysulfide is an inorganic compound, a salt of lanthanum and hydrogen sulfide acid, with the formula La
₂O
₂S.

Synthesis

• Calcination of lanthanum(III) sulfate in oxygen current at 750 °C:

La₂(SO₄)₃ + O₂ → La₂O₃·SO₃ + 2SO₃

• The resulting product is reduced with hydrogen when heated:

La₂O₃·SO₃ + 4H₂ → La₂O₂S + 4H₂O

Physical properties

The compound forms yellowish-white hexagonal crystals.

Uses

The compound is used as a laser host material.

References

1. "Lanthanum Oxysulfide | CAS 12031-43-5 | Lorad Chemical Corporation". Lorad Chemical. Retrieved 21 March 2023.
2. "CAS 12031-43-5 Lanthanum oxide sulfide(La2O2S) - Alfa Chemistry". Alfa Chemistry. Retrieved 21 March 2023.
3. "Lanthanum Oxysulfide". American Elements. Retrieved 21 March 2023.
4. Pitha, John J.; Smith, Arthur L.; Ward, Roland (1947). "The Preparation of Lanthanum Oxysulfide and its Properties as a Base Material for Phosphors Stimulated by Infrared". J. Am. Chem. Soc. 69 (8): 1870–1871. doi:10.1021/ja01200a009. Retrieved 21 March 2023.
5. Koechner, Walter (11 November 2013). Solid-State Laser Engineering. Springer Science+Business Media. p. 32. ISBN 978-3-662-14105-2. Retrieved 21 March 2023.

• Lanthanum compounds
• Sulfides
• Sulfur compounds
• Oxygen compounds
• Inorganic sulfur compounds