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Adv."],"published-print":{"date-parts":[[2026,3,13]]},"abstract":"<jats:p>\n                    Argyrodites have garnered substantial interest as ultralow lattice thermal conductivity (\u03ba\n                    <jats:sub>lat<\/jats:sub>\n                    ) materials. However, their development is constrained by poor thermal stability and inferior thermoelectric performance. Here, a cubic argyrodite compound, Cu\n                    <jats:sub>6<\/jats:sub>\n                    GeTeS\n                    <jats:sub>4<\/jats:sub>\n                    , was successfully synthesized via a chemical-tailoring strategy. Moreover, a strong correlation between the multiplicity of crystallographic sites and ion mobility was found. The reduced multiplicity of Cu crystallographic sites leads to superior thermal stability compared to Cu\n                    <jats:sub>8<\/jats:sub>\n                    GeS\n                    <jats:sub>6<\/jats:sub>\n                    , which undergoes a phase transition from orthorhombic to cubic. The weak Cu\u2500S\/Te chemical bonds and cage-like [TeCu\n                    <jats:sub>18<\/jats:sub>\n                    ]\n                    <jats:sup>16+<\/jats:sup>\n                    vibrations at low frequencies lead to intrinsically ultralow \u03ba\n                    <jats:sub>lat<\/jats:sub>\n                    \u00a0~\u00a00.47 to 0.35 W\u00a0m\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0K\n                    <jats:sup>\u22121<\/jats:sup>\n                    and realize the maximum\n                    <jats:italic toggle=\"yes\">ZT<\/jats:italic>\n                    (\n                    <jats:italic toggle=\"yes\">ZT<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    ) of ~0.62 for Cu\n                    <jats:sub>6<\/jats:sub>\n                    GeTeS\n                    <jats:sub>4<\/jats:sub>\n                    . By introducing S deficiencies, the Cu\n                    <jats:sub>6<\/jats:sub>\n                    GeTeS\n                    <jats:sub>3.82<\/jats:sub>\n                    obtained an excellent peak\n                    <jats:italic toggle=\"yes\">ZT<\/jats:italic>\n                    <jats:sub>max<\/jats:sub>\n                    of 1.23 at 925 K with an ultralow \u03ba\n                    <jats:sub>lat<\/jats:sub>\n                    of ~0.25 W\u00a0m\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00a0K\n                    <jats:sup>\u22121<\/jats:sup>\n                    . This study presents high-performance thermoelectrics and provides insights to the design of liquid-like systems.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aec9220","type":"journal-article","created":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T17:58:33Z","timestamp":1773424713000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Reduced multiplicity of crystallographic sites for superior thermoelectric performance of cubic Cu\n                    <sub>6<\/sub>\n                    GeTeS\n                    <sub>4<\/sub>\n                    via chemical tailoring"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-8088-7308","authenticated-orcid":true,"given":"Ya","family":"Yang","sequence":"first","affiliation":[{"name":"College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. 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