Mechanochemical synthesis and structural characterization of gallium sulfide Ga₂S₃

Killian Denoue (1) , François Cheviré (1) , Christophe Calers (1) , Louisiane Verger (1) , David Le Coq (1) , Laurent Calvez (1)

1 ISCR - Institut des Sciences Chimiques de Rennes

Crystalline gallium (III) sulfide Ga₂S₃ samples have been prepared by mechanical-alloying instead of usual heating process. A safe, energy-efficient, and fast process of only 4 h of mechanosynthesis led to the formation of polycrystalline Ga₂S₃ from pure Ga and S as raw materials. X-ray diffraction measurements and Rietveld refinements show that the as-prepared material is a mixture of mainly hexagonal wurtzite-type β-phase (68 ± 5 wt%; space group P6₃mc (No. 186)) along with some cubic sphalerite-type γ-phase (32 ± 5 wt%; space group F-43m (No. 216)). In situ high-temperature X-ray diffraction measurements show that the monoclinic phase (space group Cc (No. 9)) appears at 450 °C. Scanning electron microscopy analyses reveal that the morphology of the powder is characterized by aggregates of nanometric particles. Their sizes measured by laser diffraction show a median size around 170 nm after 4 h of ball-milling.

Mots clés: Gallium sulfide; Mechanochemical synthesis; X-ray diffraction; Chalcogenide

Domaines: Chimie; Matériaux

Killian Denoue, François Cheviré, Christophe Calers, Louisiane Verger, David Le Coq, et al.. Mechanochemical synthesis and structural characterization of gallium sulfide Ga₂S₃. Journal of Solid State Chemistry, 2020, 292, pp.121743. ⟨10.1016/j.jssc.2020.121743⟩. ⟨hal-02945078⟩