Dielectric Response of Ceramic-Polymer Composite with High Permittivity

2008 ◽  
Vol 1134 ◽  
Author(s):  
Xiaobing Shan ◽  
Lin Zhang ◽  
Pei-xuan Wu ◽  
Canran Xu ◽  
Zhong-Yang Cheng
Keyword(s):  
Dielectric Constant ◽  
Dielectric Response ◽  
Casting Method ◽  
Uniform Size ◽  
Layer Composite ◽  
Solution Casting Method ◽  
High Dielectric ◽  
High Flexibility ◽  
Sintering Method ◽  
Nano Size

AbstractBased on solution casting method, a ceramic [CaCu3Ti4O12 (CCTO)]-Polymer [P(VDF-TrFE)] composite with flexibility has been synthesized and its dielectric response has been studied. The CCTO ceramic powders were prepared by traditional sintering method and were milled with a relative uniform size. The dielectric properties of these films with micro-size and nano-size CCTO particle, as well as different polymer matrixes were determined. The process was optimized by hot pressing and surface modification to achieve high dielectric constant. A dielectric constant about 175 for one layer composite with high flexibility using silane coupling agent was obtained at 1 kHz at room temperature.

Dielectric Properties of CaCu3Ti4O12-P(VDF-TrFE) Composite

2006 ◽  
Vol 949 ◽  
Author(s):  
Xiaobing Shan ◽  
Xin Yang ◽  
Kewei Zhang ◽  
Zhongyang Cheng
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Powder Processing ◽  
Ceramic Powders ◽  
Casting Method ◽  
Uniform Size ◽  
Solution Casting Method ◽  
High Dielectric ◽  
Conventional Solution

ABSTRACTBy using conventional solution casting method, a flexible ceramic [CaCu3Ti4O12 (CCTO)]-Polymer [P(VDF-TrFE)] composite has been fabricated. The CCTO ceramic powders with a relative uniform size were prepared by traditional powder processing method. The dielectric properties of these films with different CCTO fractions were determined. The process was optimized to achieve high dielectric constant. A dielectric constant about 510 at room temperature and 1240 at 95 °C at 1 kHz for 6 layer hot compression was obtained.

Effect the Ratio and Particle Size of Glass Powder from Fluorescent Tubes Waste on Electrical Properties of PVA-Glass Composites

2021 ◽  
Vol 19 (10) ◽  
pp. 106-114
Author(s):  
Hani M Hussien
Keyword(s):  
Electrical Conductivity ◽  
Particle Size ◽  
Dielectric Constant ◽  
Glass Powder ◽  
Dissipation Factor ◽  
Powder Particle Size ◽  
Casting Method ◽  
Glass Composites ◽  
Mixing Ratios ◽  
Solution Casting Method

The polymer composites used in the present study were made of polyvinyl alcohol (PVA) as a matrix and glass powder as a filler. The glass powder was obtained from fluorescent tubes waste. The solution casting method was used to fabricate PVA/glass powder composite. Three groups of samples were prepared. The first was prepared by using PVA with the addition of glass powder (sieved less than 20 μm) in proportions 10, 20, 30, 40, and 50 %. The second: the mixing ratios of PVA and glass powder were 80% and 20%, respectively. The third: The mixing ratios of PVA and glass powder were 60% and 40%, respectively. In Both previous groups, the added glass powder used was sieved with sizes less than 20, 45, 105, and 125 μm. For all samples, the following properties were measured at room temperature: DC electrical conductivity, dielectric constant, electrical conductivity, and dissipation factor. The last three properties were measured with a range of frequencies from 1kHz to 5MHz. DC conductivity increases with increasing of glass powder. It was found that the highest conductivity values are for samples composed of glass powder with a particle size of less than 45 μm for both ratios of glass 20% and 40%. It is also noticed that within most frequencies, the sample with 30% glass has the largest dissipation factor. At 20% filler of glass powder, it is noted that the highest values of the dielectric constant are for samples composed of glass powder with a particle size of less than 45 μm and 125 μm. Below 1 MHz, the effect of glass powder particle size on the AC conductivity is minimal. It is found that the samples containing glass powder (less than 125 μm and 105 μm), have similar and lowest dissipation factor. At 40% filler of glass powder, it is noted that the lowest values of the dielectric constant are for samples composed of glass powder with a particle size little than 105 μm.

scholarly journals Crystallization and Dielectric Properties of MWCNT /Poly(1-Butene) Composite Films by a Solution Casting Method

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 755
Author(s):  
Lingfei Li ◽  
Qiu Sun ◽  
Xiangqun Chen ◽  
Yongjun Xu ◽  
Zhaohua Jiang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Breakdown Strength ◽  
Composite Films ◽  
Conductive Filler ◽  
Interfacial Polarization ◽  
Solution Casting ◽  
Casting Method ◽  
Solution Casting Method

In this work, poly(1-butene) (PB-1) composite films with multi-walled carbon nanotubes (MWCNT) were prepared by a solution casting method. The relationship between the dielectric properties and the crystal transformation process of the films was investigated. It was indicated that there were two crystal forms of I and II of PB-1 during the solution crystallization process. With the prolongation of the phase transition time, form II was converted into form I. The addition of the conductive filler (MWCNT) accelerated the rate of phase transformation and changed the nucleation mode of PB-1. The presence of crystal form I in the system increased the breakdown strength and the dielectric constant of the films and reduced the dielectric loss, with better stability. In addition, the dielectric constant and the dielectric loss of the MWCNT/PB-1 composite films increased with the addition of MWCNT, due to the interfacial polarization between MWCNT and PB-1 matrix. When the mass fraction of the MWCNT was 1.0%, the composite film had a dielectric constant of 43.9 at 25 °C and 103 Hz, which was 20 times that of the original film.

X7R type lead complex perovskite ferroelectric ceramics with high dielectric constant

1998 ◽  
Vol 13 (2) ◽  
pp. 253-256 ◽  
Author(s):  
Lijian Ruan ◽  
Longtu Li ◽  
Zhilun Gui
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Temperature Stability ◽  
Ferroelectric Ceramics ◽  
Complex Perovskite ◽  
Two Phase ◽  
Dielectric Ceramics ◽  
High Dielectric ◽  
Lead Complex ◽  
Sintering Method

A new X7R type dielectric ceramics for the PMN-BT-PT system with a high dielectric constant (4832) and a low firing temperature (1100–1130 °C) was prepared by the mixed-sintering method. The results of XRD, SEM, EDAX, and dielectric measurements showed that the dielectric ceramics is a two-phase composite with the high dielectric constant originating from the ferroelectric relaxor, and the temperature stability of the dielectric properties from two-phase coexistence.

Dielectric Properties of CCTO/PVDF Composite Films

2013 ◽  
Vol 816-817 ◽  
pp. 276-279 ◽  
Author(s):  
Fang Fang Wang ◽  
Ya Jun Wang ◽  
Zhi Bo Ren
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Composite Films ◽  
Solution Casting ◽  
Casting Method ◽  
Impedance Analyzer ◽  
Composite Models ◽  
Solution Casting Method ◽  
Pvdf Matrix ◽  
Ccto Powder

To meet the requirement of microelectronic industry, ceramic/polymer composite films made of CaCu3Ti4O12(CCTO) powder as filler and PVDF copolymer as matrix were prepared by solution casting method. The dielectric properties (DP) and morphology of the films were studied by impedance analyzer and scanning electron microscope (SEM) respectively. The dielectric constant could reach 23.96 and loss 0.1082 when mass fraction of CCTO is 50% at 100 Hz. SEM results show that CCTO particles dispersed well in the PVDF matrix. At last, three composite models were used to predict the dielectric constant of the composite films and it is proved that Yamada model fits the experimental data well.

DIELECTRIC PROPERTIES OF Ca2CuO3–CaCu2O3–CuO COMPOSITE CERAMICS

2013 ◽  
Vol 27 (06) ◽  
pp. 1350042 ◽  
Author(s):  
QING-SHOU LI ◽  
YUN-QIANG ZHANG ◽  
LI-BEN LI ◽  
GUO-ZHONG ZANG
Keyword(s):  
Dielectric Properties ◽  
Schottky Barrier ◽  
Dielectric Response ◽  
Oxygen Vacancies ◽  
Arrhenius Equation ◽  
Composite Ceramics ◽  
High Dielectric ◽  
Sintering Method ◽  
Very High ◽  
Barrier Model

The Ca 2 CuO 3– CaCu 2 O 3– CuO ceramics were synthesized by traditional solid-state sintering method. The complex dielectric response of the samples measured from 102–106 Hz and from 300–500 K reveals very high real part of ε > 104. The activation energy (being about 0.63 eV) calculated by the Arrhenius equation indicates that the oxygen vacancies may contribute to the high dielectric response. And the fitting to a Schottky barrier model of capacitance versus applied voltage suggests that the existence of Schottky barrier at the grain boundaries may be another important reason for the origination of good dielectric properties.

Factors Influencing Dielectric Properties of A-171@CCTO/PVDF Composite Films

2014 ◽  
Vol 1035 ◽  
pp. 413-416
Author(s):  
Jian Wen Zhai ◽  
Ya Jun Wang ◽  
Fu Yang Li ◽  
Chang Gen Feng
Keyword(s):  
Dielectric Properties ◽  
Polyvinylidene Fluoride ◽  
High Dielectric Constant ◽  
Ethanol Concentration ◽  
Composite Films ◽  
Casting Method ◽  
Low Dielectric ◽  
Transmission Electron ◽  
Solution Casting Method ◽  
High Dielectric

Current research efforts toward achieving ceramic/polymer composites which fulfill the balance between sufficiently high dielectric constant (ε) and low dielectric loss (tanδ) are presented. In this paper, ceramic/polymer composite films made of CaCu3Ti4O12(CCTO) powder as filler, which is modified by silane coupling agent vinyltrimethoxysilane (A-171), and polyvinylidene fluoride (PVDF) copolymer as matrix were prepared by solution casting method. The morphology and dielectric properties (DP) were studied by transmission electron microscopy (TEM) and impedance analyzer. The effect of pH and ethanol concentration on the dielectric properties of A-171@CCTO/PVDF were studied. The results show that constant could reach 54.17 and loss 0.05 when mass fraction of A-171 is 0.4% at 1 kHz. pH=4 and using anhydrous ethanol are the optimal conditions.

Functional properties of donor- and acceptor-co-doped high dielectric constant zinc oxide ceramics

2019 ◽  
Vol 21 (18) ◽  
pp. 9456-9464 ◽  
Author(s):  
Raphael Lucas de Sousa e Silva ◽  
Prasun Banerjee ◽  
Adolfo Franco Júnior
Keyword(s):  
Dielectric Constant ◽  
Functional Properties ◽  
High Dielectric Constant ◽  
Oxide Ceramics ◽  
Donor And Acceptor ◽  
Solid State Sintering ◽  
High Dielectric ◽  
Sintering Method ◽  
Zno Ceramics ◽  
Co Doped

In this work we investigated the functional properties of a set of acceptor (Cu1+) and donor (Gd3+) codoped wurtzite ZnO ceramics Zn(1−x)(CuzGdy)xO for x = 0.01 synthesized by the pressure-less solid state sintering method.

Non-Destructive Evaluation of Engineering Properties of Asphalt Mixtures

2013 ◽  
Vol 723 ◽  
pp. 428-433
Author(s):  
Chieh Min Chang ◽  
Jian Shiuh Chen
Keyword(s):  
Dielectric Constant ◽  
Dielectric Response ◽  
Asphalt Mixture ◽  
Dielectric Behavior ◽  
Engineering Properties ◽  
Asphalt Pavements ◽  
Electromagnetic Devices ◽  
High Dielectric ◽  
Non Destructive ◽  
Coaxial Probe

The measurement of dielectric response has gained importance because it can be used for non-destructive monitoring of asphalt pavements. The open-ended coaxial probe technique was selected to investigate the dielectric response of the dense-graded asphalt mixture. The effects of material properties such as density on dielectric response were examined. Results indicated that density have a significant influence on dielectric behavior of asphalt mixture. The dielectric constant was shown to increase with increasing density of the asphalt mixture, whereas a high density resulted in low voids that contributed to a relatively high dielectric constant. These findings could be used to enhance the accuracy of non-destructive electromagnetic devices applied in the pavement field.

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