Lanthanum monosulfide

Lanthanum monosulfide is a binary inorganic chemical compound of lanthanum metal and sulfur with the chemical formula LaS.^[1][2]

Lanthanum monosulfide

Names
IUPAC name lanthanum; sulfide
Identifiers
CAS Number	12031-30-0
3D model (JSmol)	Interactive image
ChemSpider	128947726
InChI InChI=1S/La.S/q+2;-2 Key: GTXCIJGFTBRPNK-UHFFFAOYSA-N
SMILES [S-2].[La+2]
Properties
Chemical formula	LaS
Molar mass	170.97 g·mol−1
Appearance	golden crystals
Density	5.61 g/cm3
Melting point	2,300 °C (4,170 °F; 2,570 K)
Structure
Crystal structure	Cubic
Related compounds
Related compounds	Samarium monosulfide
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Lanthanum monosulfide can be prepared from the effect of sulfur vapor on metallic lanthanum:

La + S → LaS

It can also be prepared from the reduction of La₂S₃ with metallic La.^[3]

Physical properties

Lanthanum monosulfide forms golden crystals^[4] of the cubic system, space group Fm3m, cell parameters a = 0.586 nm, Z = 4, structurally isomorphous with NaCl.^[5]