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Energies
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Flexoelectric Effect in Dielectric Materials
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Flexoelectric Effect in Dielectric Materials

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "D1: Advanced Energy Materials".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 1624

Special Issue Editors

Dr. Xu Liang

E-Mail Website
Guest Editor
School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: theory and applications of flexoelectric solids; flexoelectricity in solid dielectrics; energy harvesting by flexoelectric materials; piezoelectricity and flexoelectricity
Dr. Weijin Chen

E-Mail Website
Guest Editor
School of Physics, Sun Yat-sen University, Guangzhou 510275, China
Interests: ferroics; piezoelectricity and flexoelectricity; domain structure; topological defects; multifield coupling
Dr. Qian Deng

E-Mail Website
Guest Editor
School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: flexoelectricity; energy harvesting; sound pressure sensors; magnetoelectric coupling; surface acoustic waves

Special Issue Information

Dear Colleagues,

We invite you to submit your research to our Special Issue of Energies on the subject area of “Flexoelectric Effect in Dielectric Materials”. Flexoelectricity describes a universal effect of dielectric materials whereby a net polarization is induced by strain gradients. This broadens the potential of nonpiezoelectric materials in applications such as sensors, actuators, and energy harvesters. It also manifests itself in material behaviours such as ferroelectric domain structure evolution and transport properties, leading to novel nanoelectronic concepts. Considerable research efforts have recently been devoted to the field of flexoelectric effects, deepening our current understanding of flexoelectricity in both fundamental and application aspects.

This Special Issue aims to report the progress of research on the different aspects related to flexoelectric effects in dielectric materials. Both review articles and original research works are welcome. The topics of interest for publication include, but are not limited to:

  • Theories and modelling of flexoelectricity;
  • Theoretical and experimental determination of flexoelectricity;
  • Mechanisms of enhanced flexoelectric(-like) effects;
  • Novel flexoelectric(-like) materials and structures;
  • Dynamic flexoelectric effect;
  • Manifestation of flexoelectric effects in material properties;
  • Applications and perspectives of flexoelectricity.

Dr. Xu Liang
Dr. Weijin Chen
Dr. Qian Deng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • flexoelectricity
  • ferroelectricity
  • piezoelectricity
  • theories and modelling
  • experimental methods
  • enhanced mechanisms
  • flexoelectric materials and structures
  • applications of flexoelectricity

Published Papers (1 paper)

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Research

11 pages, 3531 KiB  
Article
Effect of Pre-Polarization Process on the Apparent Piezoelectric Response Measured by Point-Ring Method in Ferroelectric Perovskite Oxide Ceramics
by Yuanzhe Li, Xiang Huang, Junyu Tao, Jijie Huang, Weiming Xiong, Weijin Chen and Yue Zheng
Energies 2022, 15(10), 3627; https://doi.org/10.3390/en15103627 - 16 May 2022
Viewed by 1253
Abstract
Both flexoelectricity and piezoelectricity belong to the electromechanical coupling effect. While piezoelectricity only exists in materials whose crystal structure is noncentrosymmetric and a pre-polarization process is necessary for ferroelectric piezoelectric ceramics, flexoelectricity theoretically exists in all dielectric materials and does not require pre-polarization. [...] Read more.
Both flexoelectricity and piezoelectricity belong to the electromechanical coupling effect. While piezoelectricity only exists in materials whose crystal structure is noncentrosymmetric and a pre-polarization process is necessary for ferroelectric piezoelectric ceramics, flexoelectricity theoretically exists in all dielectric materials and does not require pre-polarization. However, this does not mean that flexoelectricity would not be affected by the pre-polarization process, considering that flexoelectricity is a polarization phenomenon. In this work, we prepared ferroelectric perovskite oxide ceramics Ba1−xCaxTiO3 and revealed a strong effect of the pre-polarization process on the flexoelectric response of the ceramics, characterized by the apparent piezoelectric response measured by the point-ring method. The effective piezoelectric coefficient was separated into the one contributed by the flexoelectric(-like) response and the piezoelectric(-like) response by quasi-static d33 measurement and a two-step point-ring testing method. The effective piezoelectric coefficient contributed by the flexoelectric(-like) response of the ceramics could be largely enhanced to be over 350 pC/N after a 900 V polarization, larger than the standard piezoelectric response. The pre-polarization process was suggested to alter the polarization state and defect distributions, which would further change the overall flexoelectric response (both intrinsic and extrinsic parts) of the samples. Our work indicates a facile method to enhance the apparent piezoelectric response of flexoelectric materials under a bending mode. Full article
(This article belongs to the Special Issue Flexoelectric Effect in Dielectric Materials)
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