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Mechanochemical synthesis and structural characterization of gallium sulfide Ga2S3

Abstract : 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.
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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, Elsevier, 2020, 292, pp.121743. ⟨10.1016/j.jssc.2020.121743⟩. ⟨hal-02945078⟩

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