Lanthanum oxysulfide

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Lanthanum oxysulfide
Names
Other names
lanthanum(3+); oxygen(2-); sulfide, lanthanum oxide sulfide, dilanthanum dioxide sulphide[1]
Identifiers
3D model (JSmol)
ECHA InfoCard 100.031.578 Edit this at Wikidata
EC Number
  • 234-750-7
  • InChI=1S/2La.2O.S/q2*+3;3*-2
    Key: BZXKASZNANQGJD-UHFFFAOYSA-N
  • [O-2].[O-2].[S-2].[La+3].[La+3]
Properties
La
2O
2S
Molar mass 341.88 g/mol
Appearance yellowish-white crystals
Density 5.77 g/cm3
Related compounds
Related compounds
 Gadolinium oxysulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Lanthanum oxysulfide is an inorganic compound, a salt of lanthanum and hydrogen sulfide acid, with the formula La
2O
2S.[2][3]

Synthesis

  • Calcination of lanthanum(III) sulfate in oxygen current at 750 °C:[4]
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.[5]

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.
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