Collective nonlinear electric polarization via defect-driven local symmetry breaking

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dc.contributor.authorDong, Wen_AU
dc.contributor.authorCortie, DLen_AU
dc.contributor.authorLu, Ten_AU
dc.contributor.authorSun, QBen_AU
dc.contributor.authorNarayanan, Nen_AU
dc.contributor.authorHu, WBen_AU
dc.contributor.authorJacob, Len_AU
dc.contributor.authorLi, Qen_AU
dc.contributor.authorYu, DHen_AU
dc.contributor.authorChen, Hen_AU
dc.contributor.authorChen, APen_AU
dc.contributor.authorWei, XYen_AU
dc.contributor.authorWang, Gen_AU
dc.contributor.authorHumphrey, MGen_AU
dc.contributor.authorFrankcombe, TJen_AU
dc.contributor.authorLiu, Yen_AU
dc.date.accessioned2024-03-01T00:35:14Zen_AU
dc.date.available2024-03-01T00:35:14Zen_AU
dc.date.issued2019-05-17en_AU
dc.date.statistics2024-03-01en_AU
dc.description.abstractIn this work, we report the defect-mediated, abnormal non-linear polarization behavior observed in centrosymmetric rutile TiO2 where less than 1 at% of sterically mismatched Mg2+ ions are introduced to create ferroelectric-like polarization hysteresis loops. It is found that the Image ID:c9mh00516a-t2.gif defect cluster produces a dipole moment exceeding 6 Debye, with a rotatable component. Such a polarization is further enhanced by the displacement of neighboring Ti4+ ions. The coupling between such defect-driven symmetry-breaking regions generates a collective nonlinear electrical polarization state that persists to high temperatures. More importantly, an observation of abnormal bias shift of polarization hysteresis suggests an antiparallel alignment of certain dipoles frozen relative to the external poling electric field, which is associated with oxygen vacancy hopping. This result challenges the long-standing notion of parallel alignment of dipoles with the external electric field in ferroelectrics. This work also reveals an unexpected new form of non-linear dielectric polarization (non-ferroelectricity) in solid-state materials. © Royal Society of Chemistry 2024en_AU
dc.description.sponsorshipWD, TL, DC, TJF and YL acknowledge the support of the Australian Research Council (ARC) in the form of Discovery Projects (DP1601104780). The authors acknowledge the facilities and the scientific and technical assistance of the Australian microscopy and microanalysis research facility (AMMRF) at the Centre of advanced Microscopy, the Australian National University. This work was supported by the International Science and Technology Cooperation Program of China (Grant No. 2015D FA51100).en_AU
dc.identifier.citationDong, W., Cortie, D., Lu, T., Sun, Q., Narayanan, N., Hu, W., Jacob, L., Li, Q., Yu, D., Chen, H., Chen, A., Wei, X., Wang, G., Humphrey, M. G., Frankcombe, T. J., & Liu, Y. (2019). Collective nonlinear electric polarization via defect-driven local symmetry breaking. Materials Horizons, 6(8), 1717-1725. doi:10.1039/C9MH00516Aen_AU
dc.identifier.issn2051-6347en_AU
dc.identifier.issn2051-6355en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleMaterials Horizonsen_AU
dc.identifier.pagination1717-1725en_AU
dc.identifier.urihttp://dx.doi.org/10.1039/c9mh00516aen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15514en_AU
dc.identifier.volume6en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectPolarizationen_AU
dc.subjectMagnesiumen_AU
dc.subjectIonsen_AU
dc.subjectFerroelectric materialsen_AU
dc.subjectTemperature rangeen_AU
dc.subjectMaterialsen_AU
dc.subjectDefectsen_AU
dc.subjectOxygenen_AU
dc.titleCollective nonlinear electric polarization via defect-driven local symmetry breakingen_AU
dc.typeJournal Articleen_AU
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