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Nanomaterials
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Ferroic Nanomaterials: From Synthesis to Applications
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Ferroic Nanomaterials: From Synthesis to Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (20 September 2021) | Viewed by 11526

Special Issue Editors

Prof. Dr. Adelina-Carmen Ianculescu

E-Mail Website
Guest Editor
Department of Oxide Materials Science & Engineering, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 1-7 Gheorghe Polizu, P.O. Box 12-134, District 1, 011061 Bucharest, Romania
Interests: oxide nanomaterials (nanopowders, nanowires, nanotubes, thin films and nanostructured ceramics); bulk electroceramics (ferroelectrics, multiferroics, dielectrics, semiconductors, thermoelectrics, magnetoelectric composites: BaTiO3-based systems, BiFeO3-based systems, Pb(Zr,Ti)O3, undoped and dope; oxide catalysts (TiO2-based systems, LaFeO3, NiFe2O4, CoFe2O4, ZnAl2O4, NixZn1-xAl2O4, CoAl2O4, CoxZn1-xAl2O4)
Prof. Dr. Lucian Pintilie

E-Mail Website
Guest Editor
National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
Interests: ferroelectric; dielectric; multiferroic; pyroelectric; heterostructures; field effect transistors; photovoltaic
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ferroic materials, characterized by different types of ordering (i.e., ferroelectric, ferromagnetic, ferroelastic, or multiferroic), possess a variety of functional properties that make them extremely attractive for multiple applications ranging from electronics and telecommunications to life sciences, space, and security. Their properties can be tailored by manipulating factors such as compositional design, dopants/solutes, stoichiometry, microstructural features induced by the synthesis method, and consolidation strategies and geometry. The intensive development of nanotechnology involving miniaturization and integration of ferroic materials into semiconductor technology has generated increasing interest in studying the electric, magnetic, optic, and catalytic properties of nanosized ferroic systems. The aim of the Special Issue "Ferroic Nanomaterials: From Synthesis to Applications" is to provide updated information regarding novel preparation techniques of ferroic nanopowders, 1D nanostructures, thin films, and heterostructures, as well as nanostructured ceramics and magneto-electric composites. Another purpose is to emphasize the challenges related to the modeling, engineering, and potential applications of these nanomaterials. A special attention will be paid to the so-called "size effects", i.e. to provide explanations on how the functional properties can be modified and even how new functionalities can appear by geometrical confinement or by changing structuring from micro- to nano-scale.

Prof. Dr. Adelina-Carmen Ianculescu
Prof. Dr. Lucian Pintilie
Guest Editors

Manuscript Submission Information

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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. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

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Keywords

  • Nanoscale ferroelectrics
  • Ferroelastic effect
  • Magnetic oxide nanomaterials
  • Nanosized multiferroics
  • 1D and 2D systems in ferroic structures
  • Ferroic superlattices
  • Ferroelectric heterostructures
  • Nanostructured ferroic ceramics
  • Magneto-electric composites
  • Applications of ferroic materials

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Published Papers (3 papers)

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19 pages, 7556 KiB  
Article
Homogeneous versus Inhomogeneous Polarization Switching in PZT Thin Films: Impact of the Structural Quality and Correlation to the Negative Capacitance Effect
by Lucian Pintilie, Georgia Andra Boni, Cristina Florentina Chirila, Viorica Stancu, Lucian Trupina, Cosmin Marian Istrate, Cristian Radu and Ioana Pintilie
Nanomaterials 2021, 11(8), 2124; https://doi.org/10.3390/nano11082124 - 20 Aug 2021
Cited by 3 | Viewed by 2881
Abstract
Polarization switching in ferroelectric films is exploited in many applications, such as non-volatile memories and negative capacitance field affect transistors. This can be inhomogeneous or homogeneous, depending on if ferroelectric domains are forming or not during the switching process. The relation between the [...] Read more.
Polarization switching in ferroelectric films is exploited in many applications, such as non-volatile memories and negative capacitance field affect transistors. This can be inhomogeneous or homogeneous, depending on if ferroelectric domains are forming or not during the switching process. The relation between the polarization switching, the structural quality of the films and the negative capacitance was not studied in depth. Here, Pb(Zr0.2Ti0.8)O3 (PZT) layers were deposited by pulse laser deposition (PLD) and sol-gel (SG) on single crystal SrTiO3 (STO) and Si substrates, respectively. The structural quality was analyzed by X-ray diffraction and transmission electron microscopy, while the electric properties were investigated by performing hysteresis, dynamic dielectric measurements, and piezo-electric force microscopy analysis. It was found that the PZT layers grown by PLD on SRO/STO substrates are epitaxial while the layers deposited by SG on Pt/Si are polycrystalline. The polarization value decreases as the structure changes from epitaxial to polycrystalline, as well as the magnitude of the leakage current and of the differential negative capacitance, while the switching changes from homogeneous to inhomogeneous. The results are explained by the compensation rate of the depolarization field during the switching process, which is much faster in epitaxial films than in polycrystalline ones. Full article
(This article belongs to the Special Issue Ferroic Nanomaterials: From Synthesis to Applications)
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16 pages, 3235 KiB  
Article
Accidental Impurities in Epitaxial Pb(Zr0.2Ti0.8)O3 Thin Films Grown by Pulsed Laser Deposition and Their Impact on the Macroscopic Electric Properties
by Georgia Andra Boni, Cristina Florentina Chirila, Viorica Stancu, Luminita Amarande, Iuliana Pasuk, Lucian Trupina, Cosmin Marian Istrate, Cristian Radu, Andrei Tomulescu, Stefan Neatu, Ioana Pintilie and Lucian Pintilie
Nanomaterials 2021, 11(5), 1177; https://doi.org/10.3390/nano11051177 - 29 Apr 2021
Cited by 8 | Viewed by 2569
Abstract
Structural and electrical properties of epitaxial Pb(Zr0.2Ti0.8)O3 films grown by pulsed laser deposition from targets with different purities are investigated in this study. One target was produced in-house by using high purity precursor oxides (at least 99.99%), and [...] Read more.
Structural and electrical properties of epitaxial Pb(Zr0.2Ti0.8)O3 films grown by pulsed laser deposition from targets with different purities are investigated in this study. One target was produced in-house by using high purity precursor oxides (at least 99.99%), and the other target was a commercial product (99.9% purity). It was found that the out-of-plane lattice constant is about 0.15% larger and the a domains amount is lower for the film grown from the commercial target. The polarization value is slightly lower, the dielectric constant is larger, and the height of the potential barrier at the electrode interfaces is larger for the film deposited from the pure target. The differences are attributed to the accidental impurities, with a larger amount in the commercial target as revealed by composition analysis using inductive coupling plasma-mass spectrometry. The heterovalent impurities can act as donors or acceptors, modifying the electronic characteristics. Thus, mastering impurities is a prerequisite for obtaining reliable and reproducible properties and advancing towards all ferroelectric devices. Full article
(This article belongs to the Special Issue Ferroic Nanomaterials: From Synthesis to Applications)
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24 pages, 7698 KiB  
Article
Structural Details of BaTiO3 Nano-Powders Deduced from the Anisotropic XRD Peak Broadening
by Iuliana Pasuk, Florentina Neațu, Ștefan Neațu, Mihaela Florea, Cosmin M. Istrate, Ioana Pintilie and Lucian Pintilie
Nanomaterials 2021, 11(5), 1121; https://doi.org/10.3390/nano11051121 - 26 Apr 2021
Cited by 32 | Viewed by 5178
Abstract
In this study, nano-BaTiO3 (BTO) powders were obtained via the solvothermal method at different reaction times and were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The results were compared with those obtained for a larger crystallite size [...] Read more.
In this study, nano-BaTiO3 (BTO) powders were obtained via the solvothermal method at different reaction times and were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The results were compared with those obtained for a larger crystallite size BTO powder (BTO-m). The sizes of the cuboid crystallites (as determined by XRD and TEM) ranged from about 18 to 24 nm, depending on the reaction time. The evolution with temperature of the structure parameters of nano-BTO was monitored by means of X-ray diffraction and Raman spectroscopy and no signs of phase transition were found up to 170 °C. Careful monitoring of the dependence of the XRD peak widths on the hkl indices showed that the effect of the cubic crystallite shape upon the XRD peak widths was buried by the effect of hidden tetragonal line splits and by anisotropic microstrain. The good correlation of the line widths with the tetragonal split amplitudes, observed especially for BTO-m above the transition temperature, indicates tetragonal deformations, as also revealed by Raman spectroscopy. The large anisotropic microstrain shown by the nano-powders, which had a maximum value in the <100> directions, was considered evidence of the phenomenon of surface relaxation of cubic crystallites edged by {100} faces. The observed behavior of the nano-BTO structures with increasing temperature may suggest a correlation between the surface relaxation and tetragonal deformation in the nano-cubes. The experimental results for both nano-BTO and mezoscale-BTO are in agreement with the core-shell model. Full article
(This article belongs to the Special Issue Ferroic Nanomaterials: From Synthesis to Applications)
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