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Adv."],"published-print":{"date-parts":[[2026,10,2]]},"abstract":"<jats:p>\n                    Interfaces in oxide heterostructures act as critical regions to induce emergent and novel types of functionality in thin films. Herein, we demonstrate the creation of bulk ferroelectric heterostructures (BFHs) in monolithic ferroelectrics by nanoscale elemental partitioning, unlocking functionalities beyond the reach of conventional ferroelectrics and thin-film devices. The unique percolating, compositionally modulated networks act as built-in heterointerfaces that generate coupled ferroelectric-electrostatic-elastic fields, which stabilize charged domain walls and imprint predefined domain configurations throughout the bulk. In exemplar BiFeO\n                    <jats:sub>3<\/jats:sub>\n                    -BaTiO\n                    <jats:sub>3<\/jats:sub>\n                    ceramics, the BFH approach raises the Curie temperature to 824\u00b0C (increment \u0394\n                    <jats:italic toggle=\"yes\">T<\/jats:italic>\n                    <jats:sub>C<\/jats:sub>\n                    \u00a0&gt;\u00a0350\u00b0C) and yields superior high-temperature piezoelectric responses (\n                    <jats:italic toggle=\"yes\">d<\/jats:italic>\n                    <jats:sub>33<\/jats:sub>\n                    \u00a0&gt;\u00a0400 picocoulombs per newton,\n                    <jats:italic toggle=\"yes\">k<\/jats:italic>\n                    <jats:sub>33<\/jats:sub>\n                    \u00a0&gt;\u00a00.4), surpassing those of existing high-temperature piezoelectrics. Domain-engineered BFHs further unlock programmable control of domain switching, enabling the strongest yet tunable internal bias fields (&gt;8 megavolts per meter) in bulk materials and record-high reversible shear electrostrains (up to 0.98%) at supercoercive field levels. The BFH design concept provides a transformative platform for next-generation ferroelectric and electromechanical transduction devices with extended temperature, high-power, and high-stress capability. It also establishes a universal framework for programmable control across ferroic families, including ferroelastic, ferromagnetic, and multiferroic materials in polycrystalline, single-crystal, and thin-film forms.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aef9861","type":"journal-article","created":{"date-parts":[[2026,10,2]],"date-time":"2026-10-02T17:59:16Z","timestamp":1790963956000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Bulk ferroelectric heterostructures"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4379-6200","authenticated-orcid":true,"given":"Yizhe","family":"Li","sequence":"first","affiliation":[{"name":"Department of Materials, University of Manchester, M13 9PL Manchester, UK."},{"name":"Henry Royce Institute, University of Manchester, M13 9PL Manchester, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1202-9551","authenticated-orcid":true,"given":"Ziqi","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Materials, University of Manchester, M13 9PL Manchester, UK."},{"name":"Henry Royce Institute, University of Manchester, M13 9PL Manchester, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1074-6071","authenticated-orcid":true,"given":"Ying","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Materials, University of Manchester, M13 9PL Manchester, UK."},{"name":"Henry Royce Institute, University of Manchester, M13 9PL Manchester, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4295-4796","authenticated-orcid":true,"given":"Zhenbo","family":"Zhang","sequence":"additional","affiliation":[{"name":"Center for Adaptive System Engineering, School of Creativity and Arts, ShanghaiTech University, Shanghai 201210, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6555-3296","authenticated-orcid":true,"given":"Yun-Long","family":"Tang","sequence":"additional","affiliation":[{"name":"Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, Shenyang 110016, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew","family":"Smith","sequence":"additional","affiliation":[{"name":"Department of Materials, University of Manchester, M13 9PL Manchester, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9116-3862","authenticated-orcid":true,"given":"Matthew","family":"Lindley","sequence":"additional","affiliation":[{"name":"Department of Materials, University of Manchester, M13 9PL Manchester, UK."},{"name":"Henry Royce Institute, University of Manchester, M13 9PL Manchester, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuezhen","family":"Cao","sequence":"additional","affiliation":[{"name":"Department of Materials, University of Manchester, M13 9PL Manchester, UK."},{"name":"Henry Royce Institute, University of Manchester, M13 9PL Manchester, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0258-3241","authenticated-orcid":true,"given":"Annette K.","family":"Kleppe","sequence":"additional","affiliation":[{"name":"Diamond Light Source Ltd., Harwell Science and Innovation Campus, OX11 0DE Didcot, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1092-9406","authenticated-orcid":true,"given":"Egor","family":"Koemets","sequence":"additional","affiliation":[{"name":"Diamond Light Source Ltd., Harwell Science and Innovation Campus, OX11 0DE Didcot, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4259-7450","authenticated-orcid":true,"given":"David G.","family":"Hopkinson","sequence":"additional","affiliation":[{"name":"electron Physical Science Imaging Centre, Diamond Light Source Ltd., Harwell Science &amp; 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