Special Issue "Preparation, Characterization and Application of Ferroelectric/Piezoelectric Nanomaterials"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 31 July 2020.

Special Issue Editor

Dr. Marin Cernea
Website
Guest Editor
National Institute of Materials Physics, Bucharest 077125, Magurele, Romania
Interests: ceramics based on barium titanate BaTiO3 (BT); ceramics based on sodium bismuth titanate Bi0.5Na0.5TiO3 (BNT) doped with barium titanate (BNT-BTx); oxide materials; multifunctional composites with new architectures, such as core-shell grains, tubes, core-shell, and thin film heterostructure; wet chemical synthesis methods (sol–gel, gel-combustion, coprecipitation, and hydrothermal)

Special Issue Information

Dear Colleagues,

Ferroelectric materials have functional applications, such as energy harvesting transducers, advanced sensors, actuators in fields of energy, information, and communication. Over the last decade, ferroelectric/piezoelectric nanomaterials have received extensive attention from scientific and engineering viewpoints. They exhibit different properties from those of bulk materials due to their small size and large surface-to-volume ratios and become promising candidates for nanometer scale electronic, optical, and mechanical devices.

Barium titanate (BaTiO3, BT) was one of the first useful piezoelectric materials, but Pb(Zr,Ti)O3 (PZT) is the most widely used ferroelectric material. There is an increasing demand for the development of lead-free materials with similar piezoelectric and ferroelectric properties to the lead-based ceramics. BT continues to be a fundamental system of investigation, but it does not have properties comparable to PZT. For this reason, BT is often used in solid solution with other lead-free compounds, such as sodium bismuth titanate-Na0.5Bi0.5TiO3 (NBT), to form materials with enhanced piezoelectric and dielectric properties.

This Special Issue of Nanomaterials aims to cover the most recent advances in the synthesis procedures for the preparation of ferroelectric/piezoelectric nanomaterials with different compositions, morphologies, and structures in order to enhance their performance and breadth of applications.

Dr. Marin Cernea
Guest Editor

Manuscript Submission Information

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Keywords

  • Wet chemical synthesis
  • Ferroelectric nanomaterials
  • Piezoelectric nanomaterials
  • Dielectric characterization
  • Piezoelectric measurements.

Published Papers (1 paper)

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Research

Open AccessArticle
Lead-Free BNT–BT0.08/CoFe2O4 Core–Shell Nanostructures with Potential Multifunctional Applications
Nanomaterials 2020, 10(4), 672; https://doi.org/10.3390/nano10040672 - 03 Apr 2020
Abstract
Herein we report on novel multiferroic core–shell nanostructures of cobalt ferrite (CoFe2O4)–bismuth, sodium titanate doped with barium titanate (BNT–BT0.08), prepared by a two–step wet chemical procedure, using the sol–gel technique. The fraction of CoFe2O4 [...] Read more.
Herein we report on novel multiferroic core–shell nanostructures of cobalt ferrite (CoFe2O4)–bismuth, sodium titanate doped with barium titanate (BNT–BT0.08), prepared by a two–step wet chemical procedure, using the sol–gel technique. The fraction of CoFe2O4 was varied from 1:0.5 to 1:1.5 = BNT–BT0.08/CoFe2O4 (molar ratio). X–ray diffraction confirmed the presence of both the spinel CoFe2O4 and the perovskite Bi0.5Na0.5TiO3 phases. Scanning electron microscopy analysis indicated that the diameter of the core–shell nanoparticles was between 15 and 40 nm. Transmission electron microscopy data showed two–phase composite nanostructures consisting of a BNT–BT0.08 core surrounded by a CoFe2O4 shell with an average thickness of 4–7 nm. Cole-Cole plots reveal the presence of grains and grain boundary effects in the BNT–BT0.08/CoFe2O4 composite. Moreover, the values of the dc conductivity were found to increase with the amount of CoFe2O4 semiconductive phase. Both X-ray photoelectron spectroscopy (XPS) and Mössbauer measurements have shown no change in the valence of the Fe3+, Co2+, Bi3+ and Ti4+ cations. This study provides a detailed insight into the magnetoelectric coupling of the multiferroic BNT–BT0.08/CoFe2O4 core–shell composite potentially suitable for magnetoelectric applications. Full article
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