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Crystals
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Ferroelectrics
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Ferroelectrics

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 10774

Special Issue Editors

Dr. Caroline Borderon

E-Mail Website
Guest Editor
IETR UMR CNRS 6164, University of Nantes, 2 Rue de la Houssinière, 44322 Nantes, France
Interests: ferroelectric materials; antiferroelectric materials; domain walls; thin films; chemical solution deposition; impedance spectroscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Daesung Park

E-Mail Website
Guest Editor
Physikalisch Technische Bundesanstalt (PTB), 100 38116 Braunschweig, Germany
Interests: transmission electron microscopy (TEM); electron energy-loss spectroscopy (EELS); focused ion beam (FIB); ferroelectric material; oxygen transport membrane

Special Issue Information

Dear Colleagues,

Modern sensing techniques often call for advanced material properties found in crystalline materials. A common example is found in ferroelectric materials due to the versatility of their controlled response in the frequency domain. Given the demands of more efficient sensing technologies in research and industry, newer and more advanced properties are explored, both experimentally and theoretically. The results from such efforts contribute to the growth of sensing and controlling schemes for photoelastic analysis of stress and thermoelectric devices among others. We encourage researchers to contribute to the Special Issue of Crystal Engineering that focuses on manufacturing and characterizing nano ferroelectric materials, which is intended to provide a multidisciplinary forum for the analytical, numerical, and experimental study of crystalline materials.

Dr. Caroline Borderon
Dr. Daesung Park
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. Crystals is an international peer-reviewed open access monthly 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 2100 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

  • nanomaterials
  • ferroelectricity
  • dielectric materials
  • manufacturing techniques
  • material characterization

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Published Papers (5 papers)

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Research

14 pages, 1721 KiB  
Article
A Density-Functional Theory Study of Hole and Defect-Bound Exciton Polarons in Lithium Niobate
by Falko Schmidt, Agnieszka L. Kozub, Uwe Gerstmann, Wolf Gero Schmidt and Arno Schindlmayr
Crystals 2022, 12(11), 1586; https://doi.org/10.3390/cryst12111586 - 7 Nov 2022
Cited by 3 | Viewed by 2552
Abstract
Hole polarons and defect-bound exciton polarons in lithium niobate are investigated by means of density-functional theory, where the localization of the holes is achieved by applying the +U approach to the oxygen 2p orbitals. We find three principal configurations of hole [...] Read more.
Hole polarons and defect-bound exciton polarons in lithium niobate are investigated by means of density-functional theory, where the localization of the holes is achieved by applying the +U approach to the oxygen 2p orbitals. We find three principal configurations of hole polarons: (i) self-trapped holes localized at displaced regular oxygen atoms and (ii) two other configurations bound to a lithium vacancy either at a threefold coordinated oxygen atom above or at a two-fold coordinated oxygen atom below the defect. The latter is the most stable and is in excellent quantitative agreement with measured g factors from electron paramagnetic resonance. Due to the absence of mid-gap states, none of these hole polarons can explain the broad optical absorption centered between 2.5 and 2.8 eV that is observed in transient absorption spectroscopy, but such states appear if a free electron polaron is trapped at the same lithium vacancy as the bound hole polaron, resulting in an exciton polaron. The dielectric function calculated by solving the Bethe–Salpeter equation indeed yields an optical peak at 2.6 eV in agreement with the two-photon experiments. The coexistence of hole and exciton polarons, which are simultaneously created in optical excitations, thus satisfactorily explains the reported experimental data. Full article
(This article belongs to the Special Issue Ferroelectrics)
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8 pages, 1639 KiB  
Article
Improvement of Ferroelectricity with Two-Dimensional Enwrapping Structure
by Xi Wu and Ran Jiang
Crystals 2022, 12(9), 1272; https://doi.org/10.3390/cryst12091272 - 7 Sep 2022
Viewed by 1553
Abstract
The effect of the layered InSe intercalation structure on the ferroelectric properties of HfO2 was investigated. At low crystallization temperatures, the ferroelectric phase is formed more easily. Stronger polarization and better reliability can be achieved. This result indicates that the InSe intercalation [...] Read more.
The effect of the layered InSe intercalation structure on the ferroelectric properties of HfO2 was investigated. At low crystallization temperatures, the ferroelectric phase is formed more easily. Stronger polarization and better reliability can be achieved. This result indicates that the InSe intercalation structure is promising for engineering the ferroelectric properties of HfO2. Full article
(This article belongs to the Special Issue Ferroelectrics)
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12 pages, 5653 KiB  
Article
Microwave-Absorbing Properties of PbMg1/3Nb2/3O3-PbZrO3-PbTiO3-PbGeO3 (PMN-PZT-PG) Solid Solutions on a Microstrip Line in the Microwave Range
by Pavel Astafev, Aleksey Pavelko, Alexander Lerer, Jakov Reizenkind, Yuvenaliy Noykin and Larisa Reznichenko
Crystals 2022, 12(4), 551; https://doi.org/10.3390/cryst12040551 - 15 Apr 2022
Cited by 3 | Viewed by 1802
Abstract
In this paper, a brief review of the current state of research on ferroelectric, ferromagnetic, and multiferroic materials in the microwave range is given, and the main research methods are described. The main areas of application of functional materials in radio electronics are [...] Read more.
In this paper, a brief review of the current state of research on ferroelectric, ferromagnetic, and multiferroic materials in the microwave range is given, and the main research methods are described. The main areas of application of functional materials in radio electronics are outlined. Multicomponent ferroelectric media based on ferroelectric (PbTiO3), antiferroelectric (PbZrO3), and relaxors (PbMg1/3Nb2/3O3) are considered promising radio-absorbing materials. A method for comparing the electrical parameters of samples using a microstrip line and a network analyzer is described in detail, in which cylindrical samples were placed on a microstrip line. The measurements were carried out in the frequency range 10 MHz–20 GHz. Based on the frequency dependences of the S parameters, the relationships between the resonant frequencies of the samples and their composition were determined. The frequency dependences of the absorption coefficient were calculated for materials of various compositions. For each composition, the effective absorption band was calculated, and a pattern of its distribution over the concentrations of the system components was plotted. For empty areas of the phase diagram, interpolation was performed using the obtained results, which made it possible to obtain a qualitative idea of the radio-absorbing properties of the entire system. It was revealed that the compositions with the greatest variety of different phases had the widest absorption band. The results obtained will help in future research and composition selection for further development of microwave devices such as dielectric resonators, filters, and attenuators. Full article
(This article belongs to the Special Issue Ferroelectrics)
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15 pages, 2040 KiB  
Article
Resonance Analysis of Piezoelectric Bulk Acoustic Wave Devices Based on YCOB Crystals with Monoclinic Symmetry Excited by Lateral Electric Fields
by Dudu Chen, Peng Zhao, Fei Sun, Tingfeng Ma, Lili Yuan, Rongxing Wu, Peng Li and Zhenghua Qian
Crystals 2022, 12(4), 542; https://doi.org/10.3390/cryst12040542 - 12 Apr 2022
Cited by 2 | Viewed by 2149
Abstract
The monoclinic YCOB crystal still maintains good piezoelectric properties at 800 °C; thus, it has a good application prospect in high-temperature piezoelectric acoustic wave sensors. However, due to the lower symmetry compared crystals in trigonal and tetragonal systems, the exciting characteristics of piezoelectric [...] Read more.
The monoclinic YCOB crystal still maintains good piezoelectric properties at 800 °C; thus, it has a good application prospect in high-temperature piezoelectric acoustic wave sensors. However, due to the lower symmetry compared crystals in trigonal and tetragonal systems, the exciting characteristics of piezoelectric plates based on monoclinic YCOB crystals are more complicated. The vibration analysis model of lateral-field-excitation (LFE) devices based on monoclinic crystals is scarce; thus, the coupling relationships between different vibration modes and energy-trapping characteristics of the devices are unclear, which hinders the optimal design of devices. In this paper, by using Mindlin plate theory, the high-frequency vibrations of piezoelectric resonators based on monoclinic YCOB crystal plates excited by a lateral electric field are modeled and analyzed. The coupling relationships between the vibration modes of the device are clarified. The influences of the electrode width, electrode/plate mass ratio and electrode gap value on resonances and energy-trapping characteristics of the device are achieved. In addition, the effects of the structure parameters on the mass sensitivity of the monoclinic YCOB LFE devices are investigated, which are further verified by FEM simulations. The results are crucial to obtaining good resonance and sensing characteristics for LFE high-temperature piezoelectric sensors based on crystals with monoclinic symmetry. Full article
(This article belongs to the Special Issue Ferroelectrics)
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8 pages, 4205 KiB  
Article
Dielectric Properties of Mg2TiO4-Doped Ca0.65Sr0.35Zr0.65Ti0.35O3 with High Withstand Voltage and Low Loss
by Yun Liu, Binbin Huang, Xiaoyang Chen and Ping Yu
Crystals 2022, 12(3), 405; https://doi.org/10.3390/cryst12030405 - 16 Mar 2022
Cited by 2 | Viewed by 1776
Abstract
Mg2TiO4-doped Ca0.65Sr0.35Zr0.65Ti0.35O3 (CSZT) thin films with different Mg2TiO4 concentrations were deposited on the LaNiO3(LNO)/p-Si substrate using radio-frequency magnetron sputtering technology. The dielectric response of the [...] Read more.
Mg2TiO4-doped Ca0.65Sr0.35Zr0.65Ti0.35O3 (CSZT) thin films with different Mg2TiO4 concentrations were deposited on the LaNiO3(LNO)/p-Si substrate using radio-frequency magnetron sputtering technology. The dielectric response of the prepared x% Mg2TiO4-CSZT thin films with frequency, voltage, and temperature was systematically studied. The tanδ and leakage current density of CSZT thin films were reduced effectively by introducing Mg2TiO4 content. The prepared 6% Mg2TiO4-CSZT thin film, due to its low loss (tanδ ~0.01 at 1 MHz), satisfied temperature stability (TCC ~−68 ppm/°C, from −55 °C to 205 °C), high withstand voltage (>160 V), and small leakage current density (about 3.34 × 10−6 A/cm2 at operating voltage of 160 V). This may be useful for capacitor materials in the next generation of portable electronic systems. Full article
(This article belongs to the Special Issue Ferroelectrics)
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