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Advances in Ferroelectric Nanoparticles

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Dear Colleagues,

Ferroelectrics are among the most used and studied materials in the scientific community and industry. These materials show various attractive properties, such as optimal dielectric properties, huge nonlinearity, piezoelectricity, and pyroelectricity; therefore, they are suitable for various applications, such as capacitors, sensors, actuators, memory devices, and solar cells. Currently, special attention is being paid to the control of ferroelectric properties at the nanoscale via synthesis and investigations of objects with restricted geometry: nanoparticles, thin films, composites with nanoparticles, ferroelectric nanoregions and domains. New phenomena such as size effect, flexoelectricity, ferroelectric domains dynamics and others are important in the control and modification of properties of ferroelectrics at the nanoscale. Miniaturized integrated electronics applications also require further development and a deeper understanding of the technology and functioning of nanoferroelectric materials, as well as the investigation and optimization of the modified properties.

The aim of this Special Issue is to present a contemporary view of ferroelectric multifunctional materials, both at nanoscale and in a general view, which are highly important materials for electronics applications. This Special Issue aims to collect manuscripts dealing with all aspects of the structure, synthesis, properties, technologies, and investigation techniques of ferroelectric nanoparticles, thin films, composites, all forms of ferroelectrics and related smart materials.

Dr. Jan Macutkevic
Guest Editor

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Research

12 pages, 7980 KiB

Open AccessArticle

Effects of Fe, Mn Individual Doping and (Fe, Mn) Co-Doping on Ferromagnetic Properties of Co₂Si Powders

by Jiang Zou, Lifeng Wang, Juan He, Bo Wu and Quan Xie

Nanomaterials 2022, 12(2), 293; https://doi.org/10.3390/nano12020293 - 17 Jan 2022

Cited by 1 | Viewed by 1928

Abstract

Magnetic materials are crucial energy materials that are widely used in day-to-day life. Therefore, the development and study of high-performance magnetic materials are of great significance. In this study, the magnetic materials Co

_{66.6}

_{33.4}

, Co

_{60.6}

_{6}

_{33.4}

[...] Read more.

_{66.6}

_{33.4}

, Co

_{60.6}

_{6}

_{33.4}

(X = Fe, Mn), and Co

_{60.6}

_{3}

_{3}

_{33.4}

were prepared via the ball milling and sintering processes. Their crystal structures, electrical conductivity, and magnetic properties were investigated via the X-ray diffraction analysis and by using a resistivity tester, vibrating sample magnetometer, and vector network analyser. The X-ray diffraction analysis revealed that a single phase of Co

_{66.6}

_{33.4}

and its doped alloy powders were successfully obtained. The electrical conductivities of Mn

_{6}

_{60.6}

_{33.4}

and Fe

_{3}

_{3}

_{60.6}

_{33.4}

were measured using a resistivity tester. The results indicate that Mn doping and Fe and Mn Co-doping enhanced the electrical conductivity of Co

_{66.6}

_{33.4}

. The magnetic properties of Co

_{66.6}

_{33.4}

were determined using a vibrating sample magnetometer. We observed that the magnetic properties were enhanced after doping. Co

_{60.6}

_{3}

_{3}

_{33.4}

exhibited excellent magnetic properties. Further, its permeability was determined using a vector network analyser. At a low frequency, the u’ and u” values of Co

_{60.6}

_{6}

_{33.4}

and Co

_{60.6}

_{3}

_{3}

_{33.4}

were enhanced; whereas, at a high frequency, after doping, the u’ and u” values changed only slightly. This study can be used as a basis for future studies on magnetic functional materials. Full article

(This article belongs to the Special Issue Advances in Ferroelectric Nanoparticles)

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10 pages, 3737 KiB

Open AccessArticle

Coexistence of Flexo- and Ferro-Electric Effects in an Ordered Assembly of BaTiO₃ Nanocubes

by Kyuichi Yasui, Hiroki Itasaka, Ken-ichi Mimura and Kazumi Kato

Nanomaterials 2022, 12(2), 188; https://doi.org/10.3390/nano12020188 - 6 Jan 2022

Cited by 6 | Viewed by 1987

Abstract

It has been reported that the flexoelectric effect could be dominant in the nanoscale. The discrepancy between theory and experiments on the frequency dependence of the dielectric constant of an ordered assembly of BaTiO₃ nanocubes is nearly resolved by assuming the coexistence of flexo- and ferro-electric effects. Although flexoelectric polarizations perpendicular to the applied alternating electric field contribute to the dielectric constant, those parallel to the electric field do not contribute because the magnitude of the flexoelectric polarization does not change due to the mismatch of strain at the interface of the nanocubes. On the other hand, some dielectric response is possible for the ferroelectric component of the polarization parallel to the electric field. Full article

(This article belongs to the Special Issue Advances in Ferroelectric Nanoparticles)

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