Collective nonlinear electric polarization via defect-driven local symmetry breaking
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Dong, Wen; Cortie, David; Lu, Teng; Sun, Qingbo; Narayanan, Narendirakumar; Hu, Wanbiao; Jacob, Lilit; Li, Qian; Yu, Dehong; Chen, Hua; Chen, Aiping; Wei, Xiaoyong; Wang, Genmiao; Humphrey, Mark; Frankcombe, Terry J.; Liu, Yun
Description
In 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...[Show more]
dc.contributor.author | Dong, Wen | |
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dc.contributor.author | Cortie, David | |
dc.contributor.author | Lu, Teng | |
dc.contributor.author | Sun, Qingbo | |
dc.contributor.author | Narayanan, Narendirakumar | |
dc.contributor.author | Hu, Wanbiao | |
dc.contributor.author | Jacob, Lilit | |
dc.contributor.author | Li, Qian | |
dc.contributor.author | Yu, Dehong | |
dc.contributor.author | Chen, Hua | |
dc.contributor.author | Chen, Aiping | |
dc.contributor.author | Wei, Xiaoyong | |
dc.contributor.author | Wang, Genmiao | |
dc.contributor.author | Humphrey, Mark | |
dc.contributor.author | Frankcombe, Terry J. | |
dc.contributor.author | Liu, Yun | |
dc.date.accessioned | 2020-03-19T03:57:52Z | |
dc.identifier.issn | 2051-6347 | |
dc.identifier.uri | http://hdl.handle.net/1885/202380 | |
dc.description.abstract | In 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. | |
dc.description.sponsorship | WD, TL, DC, TJF and YL acknowledge the support of the Australian Research Council (ARC) in the form of Discovery Projects (DP1601104780). | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Royal Society of Chemistry | |
dc.rights | © The Royal Society of Chemistry 2019 | |
dc.source | Materials Horizons | |
dc.title | Collective nonlinear electric polarization via defect-driven local symmetry breaking | |
dc.type | Journal article | |
local.identifier.citationvolume | 6 | |
dc.date.issued | 2019-10-01 | |
local.publisher.url | https://www.rsc.org/ | |
local.type.status | Accepted Version | |
local.contributor.affiliation | Dong, Wen, Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Cortie, D., Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Lu, Teng, Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Sun, Qingbo, Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Narayanan, N., Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Wu, Wanbiao, Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Wang, Genmiao, Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Humphrey, M. G., Research School of Chemistry, The Australian National University | |
local.contributor.affiliation | Liu, Yun, Research School of Chemistry, The Australian National University | |
dc.relation | http://purl.org/au-research/grants/arc/DP1601104780 | |
local.bibliographicCitation.issue | 8 | |
local.bibliographicCitation.startpage | 1717 | |
local.bibliographicCitation.lastpage | 1725 | |
local.identifier.doi | 10.1039/C9MH00516A | |
dcterms.accessRights | Open Access | |
dc.provenance | http://sherpa.ac.uk/romeo/issn/2051-6347/..."author can archive post-print (ie final draft post-refereeing). 12 months embargo" from SHERPA/RoMEO site (as at 19/03/2020). | |
Collections | ANU Research Publications |
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