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Collective nonlinear electric polarization via defect-driven local symmetry breaking

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


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]

CollectionsANU Research Publications
Date published: 2019-10-01
Type: Journal article
Source: Materials Horizons
DOI: 10.1039/C9MH00516A
Access Rights: Open Access


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