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Elasticity Modulation Due to Polarization Reversal and Ionic Motion in the Ferroelectric Superionic Conductor KTiOPO4
KTH, School of Engineering Sciences (SCI), Applied Physics.
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 38, p. 32298-32303Article in journal (Refereed) Published
Abstract [en]

The coupling between ionic degrees of freedom and ferroelectricity has received renewed attention in recent years, given that surface electrochemical processes have been shown to be intrinsically linked to ferroelectric phase stability in ultrathin ferroelectric films. However, the coupling between bulk ionic transport and local polarization switching has received less attention, as typically the bulk ionic mobilities are low for common ferroelectrics at room temperature. Here, we use the coupled band-excitation method in conjunction with site-correlated time-of-flight secondary ion mass spectrometry, to determine the coupling between ferroelectric switching and ionic motion in single crystal KTiOPO4. The local scanning probe measurements indicate a substantial softening, as determined by resonant frequency changes, during reversal of polarization along one direction. These changes are correlated with the mass spectrometry measurements, showing a polarization-dependent accumulation of K ions at the polar surfaces, thus corroborating their role in the screening process. These studies shed light on the interplay between ionic dynamics and bulk ferroelectric switching and have implications for studies on domain wall conductivity, chemical switching, and bulk and surface-screening phenomena. 

Place, publisher, year, edition, pages
American Chemical Society , 2018. Vol. 10, no 38, p. 32298-32303
Keywords [en]
ferroelectric switching, ferroelectricity, ionic conductor, ionic transport, KTiOPO4, surface-screening, Degrees of freedom (mechanics), Domain walls, Ferroelectric materials, Fighter aircraft, Ionic conduction, Natural frequencies, Polarization, Secondary ion mass spectrometry, Single crystals, Solid electrolytes, Switching, Ultrathin films, Ionic transports, Surface screening, Ferroelectric films
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-236680DOI: 10.1021/acsami.8b07537ISI: 000446142100052PubMedID: 30152677Scopus ID: 2-s2.0-85053628979OAI: oai:DiVA.org:kth-236680DiVA, id: diva2:1262587
Funder
Swedish Foundation for Strategic Research Swedish Research Council
Note

Export Date: 22 October 2018; Article; Correspondence Address: Vasudevan, R.K.; Center for Nanophase Materials Sciences, Oak Ridge National LaboratoryUnited States; email: vasudevanrk@ornl.gov; Funding details: DOE, U.S. Department of Energy; Funding details: VR, Vetenskapsrådet; Funding details: SSF, Stiftelsen för Strategisk Forskning; Funding details: SC, Office of Science; Funding details: DE-AC05-00OR22725; Funding details: DMSE, Division of Materials Sciences and Engineering; Funding details: CNMS2017-066; Funding text: A portion of this work was sponsored by the U.S. Department of Energy (DOE), Office of Science, Materials Sciences and Engineering Division (R.K.V. and S.V.K.). Research was conducted at the Center for Nanophase Materials Sciences (A.I., S.J., O.S.O.), which is a DOE Office of Science User Facility, and using instrumentation within ORNL’s Materials Characterization Core provided by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. G.L. and C.C. acknowledge support and access to the Center for Nanophase Materials Sciences through the proposal CNMS2017-066. G.L. and C.C. also acknowledge support from the Swedish Foundation for Strategic Research and the Swedish Research Council (VR) through its Linné Center for Advanced Optics and Photonics (ADOPT). QC 20181112

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2020-03-09Bibliographically approved

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