scholarly journals Size, Shape, and Material Effects in Ferroelectric Octahedral Nanoparticles

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Daopei Zhu ◽  
Haocheng Yan ◽  
Siyuan Tian ◽  
Zhangli Wang
Keyword(s):  
Dielectric Permittivity ◽  
Dielectric Medium ◽  
Material Parameters ◽  
Low Dielectric ◽  
High Dielectric Permittivity ◽  
The Matrix ◽  
Potential Applications ◽  
Critical Particle Size ◽  
High Dielectric ◽  
Low Permittivity

Composite materials composed of multiferroelectric nanoparticles in dielectric matrixes have attracted enormous attention for their potential applications in developing future functional devices. However, the functionalities of ferroelectric nanoparticles depend on shapes, sizes, and materials. In this paper, a time-dependent Landau-Ginzburg method has been used and combined with a method as the coupled-physics finite-element-method-based simulations are used to illustrate the polarization behavior in isolated BaTiO3 or PbTiO3 octahedral nanoparticles embedded in a dielectric medium, like SrTiO3 (ST, high dielectric permittivity) and amorphous silica (a-SiO2, low dielectric permittivity). The equilibrium polarization topology of the octahedral nanoparticle is strongly affected by the choice of inclusion and the size of matrix materials. Also, there are three equilibrium polarization patterns, i.e., monodomain, vortex-like, and multidomain, because of the various sizes and material parameters combination. There is a critical particle size below which ferroelectricity vanishes in our calculations. This size of the PbTiO3 octahedral nanoparticle is 2.5 and 3.6 nm for high- and low-permittivity matrix materials, respectively. However, this size of the BaTiO3 octahedral nanoparticle is 3.6 nm regardless of the matrix materials.

scholarly journals Thermoplastic Polyurethane/Lead Zirconate Titanate/Carbon Nanotube Composites with Very High Dielectric Permittivity and Low Dielectric Loss

2020 ◽  
Vol 4 (3) ◽  
pp. 137
Author(s):  
Gayaneh Petrossian ◽  
Nahal Aliheidari ◽  
Amir Ameli
Keyword(s):  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Lead Zirconate Titanate ◽  
Thermoplastic Polyurethane ◽  
Lead Zirconate ◽  
Low Dielectric ◽  
High Dielectric Permittivity ◽  
Tan Δ ◽  
High Dielectric ◽  
Very High

Ternary composites of flexible thermoplastic polyurethane (TPU), lead zirconate titanate (PZT), and multiwalled carbon nanotubes (MWCNTs) with very high dielectric permittivity (εr) and low dielectric loss (tan δ) are reported. To assess the evolution of dielectric properties with the interactions between conductive and dielectric fillers, composites were designed with a range of content for PZT (0–30 vol%) and MWCNT (0–1 vol%). The microstructure was composed of PZT-rich and segregated MWCNT-rich regions, which could effectively prevent the formation of macroscopic MWCNT conductive networks and thus reduce the high ohmic loss. Therefore, εr increased by a maximum of tenfold, reaching up to 166 by the addition of up to 1 vol% MWCNT to TPU/PZT. More importantly, tan δ remained relatively unchanged at 0.06–0.08, a similar range to that of pure TPU. εr/tan δ ratio reached 2870 at TPU/30 vol% PZT/0.5 vol% MWCNT, exceeding most of the reported values. This work demonstrates the potential of three-phase polymer/conductive filler/dielectric filler composites for efficient charge storage applications.

A versatile foaming platform to fabricate polymer/carbon composites with high dielectric permittivity and ultra-low dielectric loss

2019 ◽  
Vol 7 (1) ◽  
pp. 133-140 ◽  
Author(s):  
Biao Zhao ◽  
Mahdi Hamidinejad ◽  
Chongxiang Zhao ◽  
Ruosong Li ◽  
Sai Wang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Carbon Composite ◽  
Carbon Composites ◽  
Low Dielectric ◽  
Composite Foams ◽  
High Dielectric Permittivity ◽  
High Dielectric

A microcellular structure can effectively tune the dielectric properties of PVDF/carbon composite foams.

High dielectric permittivity and low dielectric loss nanocomposites based on poly(VDF–TrFE–CTFE) and graphene nanosheets

2013 ◽  
Vol 03 (02) ◽  
pp. 1350010 ◽  
Author(s):  
Fei Wen ◽  
Zhuo Xu ◽  
Weimin Xia ◽  
Xiaoyong Wei ◽  
Zhicheng Zhang
Keyword(s):  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Graphene Nanosheets ◽  
Charge Storage ◽  
Low Loss ◽  
Low Dielectric ◽  
High Dielectric Permittivity ◽  
Solution Cast ◽  
High Dielectric ◽  
Dielectric Polymer

In this work, nanocomposites (poly(vinylidenefluoride–trifluoroethylene–chlorotrifluoroethylene)/Graphene nanosheets) (P(VDF–TrFE–CTFE)/GNS) were fabricated via solution cast process. GNS were covalently functionalized with KH550 to improve their interfacial interactions with the terpolymer matrix P(VDF–TrFE–CTFE). Compared to neat terpolymer, significantly improved dielectric permittivity and low loss were observed for the composites. For instance, at 1 kHz the P(VDF–TrFE–CTFE)/GNS composites with 4% GNS possessed a dielectric permittivity of 144, over 14 times larger than that of neat terpolymer, while the loss was only 0.56. These findings represent an effective route to design potential dielectric polymer films for high-charge storage capacitors.

SiO2–Ti0.98In0.01Nb0.01O2 composite ceramics with low dielectric loss, high dielectric permittivity and an enhanced breakdown electric field

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 20074-20080 ◽  
Author(s):  
Jinglei Li ◽  
Zhuo Xu ◽  
Fei Li ◽  
Xuhui Zhu ◽  
Shujun Zhang
Keyword(s):  
Solid State ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
Composite Ceramics ◽  
Breakdown Electric Field ◽  
Low Dielectric ◽  
High Dielectric Permittivity ◽  
Solid State Sintering ◽  
High Dielectric

SiO2–Ti0.98In0.01Nb0.01O2 (SiO2–TINO) composite ceramics were synthesized by solid-state sintering methods, where the lower dielectric loss and enhanced breakdown electric field were achieved.

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