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Adv."],"published-print":{"date-parts":[[2026,3,13]]},"abstract":"<jats:p>\n                    Pursuing high-performance lead-free piezoelectrics beyond classical thickness limits remains challenging. This study identifies a transitional phase between rhombohedral and tetragonal structures in strained ultrathin BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    layers within (BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    \/Ca\n                    <jats:sub>0.96<\/jats:sub>\n                    Ce\n                    <jats:sub>0.04<\/jats:sub>\n                    MnO\n                    <jats:sub>3<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    multilayer films grown on LaAlO\n                    <jats:sub>3<\/jats:sub>\n                    substrates. Atom-scale studies and quantitative electromechanical atomic force microscopy revealed that the transitional phase facilitates continuous polarization rotation in ultrathin BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    layers. This effect enhances the piezoelectric responses of the multilayer films and yields a giant piezoelectric coefficient (\n                    <jats:italic toggle=\"yes\">d<\/jats:italic>\n                    <jats:sub>33<\/jats:sub>\n                    \u00a0\u2248\u00a030\u00a0picometers per volt) for films containing 16\u2013unit cell BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    layers, which is over four times higher than conventional rhombohedral BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    . Phase-field simulations confirmed a thickness-dependent electromechanical coupling regularity, behaving as the coexistence of transitional\/tetragonal mixed phases and dense nanodomains in strained ultrathin BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    layers. This work breaks the thickness limit of single-layer BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    for electromechanical applications and proposes a thickness-domain design strategy for lead-free piezoelectric heterostructures.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aeb7174","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":["Thickness-confined metastable phase transitions drive large piezoelectricity in ultrathin BiFeO\n                    <sub>3<\/sub>"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-6319-213X","authenticated-orcid":true,"given":"Shuang-Jie","family":"Chen","sequence":"first","affiliation":[{"name":"Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China."},{"name":"School of Materials Science and Engineering, University of Science and Technology of China, Wenhua Road 72, Shenyang 110016, China."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3015-6308","authenticated-orcid":true,"given":"Meixiong","family":"Zhu","sequence":"additional","affiliation":[{"name":"Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China."},{"name":"School of Materials Science and Engineering, University of Science and Technology of China, Wenhua Road 72, Shenyang 110016, China."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jing-Hui","family":"Wang","sequence":"additional","affiliation":[{"name":"Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China."},{"name":"School of Materials Science and Engineering, University of Science and Technology of China, Wenhua Road 72, Shenyang 110016, China."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tongtong","family":"Shi","sequence":"additional","affiliation":[{"name":"Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China."},{"name":"School of Materials Science and Engineering, University of Science and Technology of China, Wenhua Road 72, Shenyang 110016, China."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-6060-642X","authenticated-orcid":true,"given":"Jiaqi","family":"Liu","sequence":"additional","affiliation":[{"name":"Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, 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