DOE OSTI · 3015137
Polymorphic Control of CsGaE 2 (E = S, Se) Using Diorganyl Dichalcogenide Precursors
Abstract
Diorganyl dichalcogenides (R–E–E–R; R = organyl, E = S, Se, Te) are widely employed for the polymorphic control of diamond-like crystal structures owing to their tunable C–E bond reactivity. In this work, we extend their application to non-close-packed alkali metal-based chalcogenides by demonstrating the selective synthesis of CsGaE 2 (E = S, Se) polymorphs. Weaker C–E bonds or higher temperatures promote the formation of the thermodynamically stable mC64 phases, while stronger C–E bonds or lower temperatures allow for the isolation of the metastable mC16 phases. Furthermore, heat-treatment studies reveal the pronounced metastability of CsGaSe 2 -mC16 particles and the irreversible phase transition of CsGaS 2 analogous to its bulk counterpart.
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Sun, Zhaohong [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000261760308), Pakhanyan, Christopher P. [University of Southern California, Los Angeles, CA (United States)] (ORCID:0009000941889567), Saleem, Usama [University of Southern California, Los Angeles, CA (United States)], Feldman, Eitan I. [Rice University, Houston, TX (United States)] (ORCID:0009000886431958), Sharada, Shaama Mallikarjun [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000173325373), Brutchey, Richard L. [University of Southern California, Los Angeles, CA (United States)] (ORCID:0000000277815596). 2025-10-24. Polymorphic Control of CsGaE 2 (E = S, Se) Using Diorganyl Dichalcogenide Precursors. https://doi.org/10.1021/acs.inorgchem.5c04153
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