Gallium(II) sulfide

Gallium(II) sulfide

Ball and stick, cell model of gallium(II) sulfide
Names
Other names Gallium sulfide
Identifiers
CAS Number	12024-10-1 Y
ChemSpider	4898760 N
Jmol 3D model	Interactive image
PubChem	6370242
InChI InChI=1S/Ga.S N Key: HLVRMBHKGAMNOI-UHFFFAOYSA-N N
SMILES S=[Ga]
Properties
Chemical formula	GaS•
Molar mass	101.788 g mol−1
Appearance	Yellow crystals
Density	3.86 g cm−3
Melting point	965 °C (1,769 °F; 1,238 K)
Structure
Crystal structure	hexagonal, hP8
Space group	P63/mmc, No. 194
Related compounds
Related compounds	Gallium(III) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Gallium(II) sulfide, GaS, is a chemical compound of gallium and sulfur. The normal form of gallium(II) sulfide as made from the elements has a hexagonal layer structure containing Ga₂⁴⁺ units which have a Ga-Ga distance of 248pm. This layer structure is similar to GaTe, GaSe and InSe. An unusual metastable form, with a distorted wurtzite structure has been reported as being produced using MOCVD. The metal organic precursors were di-tert-butyl gallium dithiocarbamates, for example Ga^tBu₂(S₂CNMe₂) and this was deposited onto GaAs. The structure of the GaS produced in this way is presumably Ga²⁺ S²⁻.

Single layers of gallium sulfide are dynamically stable two-dimensional semiconductors, in which the valence band has an inverted Mexican-hat shape, leading to a Lifshitz transition as the hole-doping is increased.

References

WebElements