Ionically-mediated electromechanical hysteresis in transition metal oxides

2011/12/23 by Yunseok Kim, Anna N. Morozovska, Kim, Yunseok +15 · 1 citation
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Material Dynamics and Properties #Materials Science (cond-mat.mtrl-sci) #Theoretical and Computational Physics #cond-mat.mtrl-sci

paper · pdf · doi:10.48550/arxiv.1112.5581

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openalex publication_date 2011/12/23 · arxiv created 2012/05/07 · arxiv updated 2012/05/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Electromechanical activity, remanent polarization states, and hysteresis loops in paraelectric TiO2 and SrTiO3 are observed. The coupling between the ionic dynamics and incipient ferroelectricity in these materials is analyzed using extended Ginsburg Landau Devonshire (GLD) theory. The possible origins of electromechanical coupling including ionic dynamics, surface-charge induced electrostriction, and ionically-induced ferroelectricity are identified. For the latter, the ionic contribution can change the sign of first order GLD expansion coefficient, rendering material effectively ferroelectric. These studies provide possible explanation for ferroelectric-like behavior in centrosymmetric transition metal oxides.

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• Tunable and Persistent Macroscopic Polarization in Nominally Centrosymmetric Defective Oxides

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