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Here, we propose a strategy for synthesizing functionalized Ga-based HEOs (GHEOs) at a low temperature (400\u00b0C) by the Ga integration mechanism. The negative mixing enthalpy between Ga and other metals reduces the Gibbs free energy, enabling the creation of homogeneous GHEOs through a hydrothermal process at a lower temperature. The Ga integration mechanism is supported by thermodynamic and density functional theory analyses. In particular, the perovskite, spinel, and rock salt crystal can be precisely tuned by choosing metal ions, enabling tailored applications in electrocatalysis, energy-saving materials, and methane sensors. Hence, this GHEOs strategy can be extended to realize many ideal GHEOs adjusted for specific applications.<\/jats:p>","DOI":"10.1126\/sciadv.adw1461","type":"journal-article","created":{"date-parts":[[2025,6,6]],"date-time":"2025-06-06T13:58:24Z","timestamp":1749218304000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":32,"title":["Liquid metal\u2013induced low-temperature synthesis of tunable high-entropy oxides"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-3832-6176","authenticated-orcid":true,"given":"Zheng","family":"Luo","sequence":"first","affiliation":[{"name":"School of Civil Engineering, Chongqing University, Chongqing 400045, P.R. 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