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Advances in Ferroelectrics and Piezoelectric Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 3784

Special Issue Editor

Science Research Department, Institute for Interdisciplinary Research, Alexandru Ioan Cuza University of Iasi, Lascar Catargi Str. 54, 700107 Iasi, Romania
Interests: ferroelectric-relaxor ceramics; multiferroic composite materials; lead-free piezoelectric porous ceramic; piezoelectric pyroelectric sensors; energy harvesting

Special Issue Information

Dear Colleagues,

In the last few years, energy harvesting from various sources has attracted a growing attention because of the actual demands in replacing fossil fuels. In particular, applications for low power devices related to portable & wireless electronics with extended lifespans are desired. The principle in these types of applications is to capture energy from ambient sources and to convert it into exploitable electrical energy. A number of sources of harvestable ambient energy have been proposed, like thermal, electromagnetic and mechanical, which can be exploited on the basis of various types of phenomena as piezo- and pyroelectricity, electrocaloric, photovoltaic effects, etc. Among the materials most interesting for energy harvesting purposes, one of the most promising is the family of piezoelectric systems along with its sub-classes of pyroelectrics and ferroelectrics. For the selection and design of ferroelectric, piezo- and pyroelectric materials for energy applications, a variety of figures of merit (FOMs) containing combinations of physical properties have to be proposed and discussed. Recent works have demonstrated the benefits of introducing porosity in ceramics for various purposes, like the adaptation of acoustic impedance in piezoelectric applications and a significant reduction of the electrical permittivity as a “sum property,” but for high FOMs it is also needed to preserve high values of piezoelectric and pyroelectric coefficients.

This Special Issue is a timely approach to survey recent progress in area of ferroelectric and piezoelectric composites materials and their applications. The articles presented in this Special Issue will cover various topics, ranging from materials design by using theoretical models, theoretical approach and the production of ferroelectric and piezoelectric materials with enhanced FOMs, functionalization, functional properties and their various applications, such as sensors (energy harvesting, chemical, biological, gas, and so on), fuel cell, electronic devices, and so on. Certainly, the coverage is not complete, but it is our intention that this Special Issue will contribute to improving the knowledge concerning the functional (electric, ferroelectric, piezoelectric, pyroelectric) properties of advanced ferroelectric and piezoelectric materials and their possible applications.

The Special Issue will cover the following topics (but is not limited to them):

  • Material design by using theoretical models
  • Preparation, optimization, and characterization of ferroelectric and piezoelectric materials
  • Porous piezoelectric materials for energy harvesting applications
  • Design and realization of electronic devices by using ferroelectric materials with enhanced properties

It is our pleasure to invite you to submit review articles, original papers, and communications for this Special Issue "Advanced in Ferroelectrics and Piezoelectric Composites."

Dr. Cristina Elena Ciomaga
Guest Editor

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. Materials 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

  • piezoelectric ceramics
  • porous materials
  • electrical properties
  • energy harvesting
  • simulation engineering

Published Papers (2 papers)

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Research

13 pages, 4606 KiB  
Article
Improved Non-Piezoelectric Electric Properties Based on La Modulated Ferroelectric-Ergodic Relaxor Transition in (Bi0.5Na0.5)TiO3-Ba(Ti, Zr)O3 Ceramics
by Xingru Zhang, Yinan Xiao, Beining Du, Yueming Li, Yuandong Wu, Liyuan Sheng and Wenchang Tan
Materials 2021, 14(21), 6666; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14216666 - 05 Nov 2021
Cited by 4 | Viewed by 1651
Abstract
The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi0.5Na0.5)TiO3 (BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize [...] Read more.
The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi0.5Na0.5)TiO3 (BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize this transition to improve relevant non-piezoelectric properties based on domain decomposition. In this work, different La contents were introduced to 0.93(Bi0.5Na0.5)TiO3-0.07Ba(Ti0.945Zr0.055)O3 ceramics (BNT-BZT-xLa) to induce evolution of ergodic degree. The results reveal that with increasing La content, both the FE-ER transition temperature TF-R and depolarization temperature Td shift towards room temperature, implying a deepened ergodic degree. By modulation of ergodic degree, thermally stimulated depolarization current experiment shows a higher current density peak, and corresponding pyroelectric coefficient increases from 2.46 to 2.81 μC/(cm2∙°C) at Td. For refrigeration, the indirect measurement demonstrates the ΔT maximum increases from 1.1 K to 1.4 K, indicating an enhanced electrocaloric effect. Moreover, the optimized energy storage effect is observed after La doping. With appearance of “slimmer” P-E loops, both calculated recoverable energy storage density Wrec and storage efficiency η increase to 0.23 J/cm3 and 22.8%, respectively. These results denote La doping conduces to the improvement of non-piezoelectric properties of BNT-based ceramics in a certain range. Therefore, La doping should be an adopted modification strategy for lead-free ceramics used in areas like refrigerator and pulse capacitors. Full article
(This article belongs to the Special Issue Advances in Ferroelectrics and Piezoelectric Composites)
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12 pages, 2639 KiB  
Article
Structural, Magnetic, Dielectric and Piezoelectric Properties of Multiferroic PbTi1−xFexO3−δ Ceramics
by Khiat Abd Elmadjid, Felicia Gheorghiu, Mokhtar Zerdali, Ina Turcan and Saad Hamzaoui
Materials 2021, 14(4), 927; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14040927 - 16 Feb 2021
Cited by 1 | Viewed by 1349
Abstract
PbTi1−xFexO3−δ (x = 0, 0.3, 0.5, and 0.7) ceramics were prepared using the classical solid-state reaction method. The investigated system presented properties that were derived from composition, microstructure, and oxygen deficiency. The phase investigations indicated that all [...] Read more.
PbTi1−xFexO3−δ (x = 0, 0.3, 0.5, and 0.7) ceramics were prepared using the classical solid-state reaction method. The investigated system presented properties that were derived from composition, microstructure, and oxygen deficiency. The phase investigations indicated that all of the samples were well crystallized, and the formation of a cubic structure with small traces of impurities was promoted, in addition to a tetragonal structure, as Fe3+ concentration increased. The scanning electron microscopy (SEM) images for PbTi1−xFexO3−δ ceramics revealed microstructures that were inhomogeneous with an intergranular porosity. The dielectric permittivity increased systematically with Fe3+ concentration, increasing up to x = 0.7. A complex impedance analysis revealed the presence of multiple semicircles in the spectra, demonstrating a local electrical inhomogeneity due the different microstructures and amounts of oxygen vacancies distributed within the sample. The increase of the substitution with Fe3+ ions onto Ti4+ sites led to the improvement of the magnetic properties due to the gradual increase in the interactions between Fe3+ ions, which were mediated by the presence of oxygen vacancies. The PbTi1−xFexO3−δ became a multifunctional system with reasonable dielectric, piezoelectric, and magnetic characteristics, making it suitable for application in magnetoelectric devices. Full article
(This article belongs to the Special Issue Advances in Ferroelectrics and Piezoelectric Composites)
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