Effects of Ca Addition on Chemical Composition, Microstructure and Dielectric Properties of BaTiO3

Owing to its high dielectric constant, barium titanate is a material commonly employed in fabrication of high energy density capacitors. Dielectric properties required for practical applications can be attained in barium titanate with desired chemical composition and microstructure. This study, therefore, aims at examining effects of additive contents on formation of secondary phases, microstructure and dielectric properties of BaTiO3 and BaTiO3 with 20-40 at% Ca. Chemical composition analysis revealed that single-phase BaTiO3 powder could be attained by the solution combustion technique. However, the powder with high Ca content exhibited large quantities of secondary phases. Dielectric property measurements of the uniaxially pressed powders indicated that dielectric constants could be enhanced with low Ca content. On the contrary, dielectric constant significantly degraded with high Ca content. This was attributed to formation of large quantities of secondary phases, coarse grain size and low density. Values of dielectric loss of all materials were lower than 1%.

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High-performance colossal permittivity materials of (Nb + Er) co-doped TiO2 for large capacitors and high-energy-density storage devices

Physical Chemistry Chemical Physics ◽

10.1039/c6cp02236g ◽

2016 ◽

Vol 18 (35) ◽

pp. 24270-24277 ◽

Cited By ~ 47

Author(s):

Mei-Yan Tse ◽

Xianhua Wei ◽

Jianhua Hao

Keyword(s):

Dielectric Properties ◽

Dielectric Loss ◽

High Performance ◽

High Energy ◽

High Energy Density ◽

Secondary Phases ◽

Storage Devices ◽

Low Dielectric ◽

Colossal Permittivity ◽

Co Doped

Our work shows contributions to the high-performance dielectric properties, including a CP of up to 104–105 and a low dielectric loss down to 0.03 in (Er0.5Nb0.5)xTi1−xO2 materials with secondary phases.

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Zirconia doped barium titanate induced electroactive β polymorph in PVDF-HFP: high energy density and dielectric properties

Materials Research Express ◽

10.1088/2053-1591/1/4/045301 ◽

2014 ◽

Vol 1 (4) ◽

pp. 045301 ◽

Cited By ~ 6

Author(s):

Maya Sharma ◽

S Ranganatha ◽

Ajay Kumar Kalyani ◽

Rajeev Ranjan ◽

Giridhar Madras ◽

...

Keyword(s):

Dielectric Properties ◽

Energy Density ◽

Barium Titanate ◽

High Energy ◽

High Energy Density ◽

Doped Barium Titanate

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Chemical Composition-Microstructure-Dielectric Constant Relations of Mg-Doped Calcium Titanate Synthesized by Solid State Reaction Technique

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.390 ◽

2017 ◽

Vol 751 ◽

pp. 390-396

Author(s):

Oratai Jongprateep ◽

Nicha Sato ◽

Jednupong Palomas ◽

Pongsakorn Jantaratana

Keyword(s):

Dielectric Constant ◽

Chemical Composition ◽

Solid State ◽

Solid State Reaction ◽

Secondary Phase ◽

Dielectric Materials ◽

Calcium Titanate ◽

Dielectric Constants ◽

Composition Analysis ◽

X Ray Diffraction

It has been generally accepted that doping of dielectric materials could significantly contribute to compositional and microstructural evolution, which consequently lead to alteration in dielectric properties. In this study, the effects of adding magnesium (Mg) at 5,10 and 20at% on the chemical composition, microstructure and dielectric constant of calcium titanate (CaTiO3) synthesized by solid state reaction was assessed. Chemical composition analysis using an X-ray diffraction technique CaTiO3 doped with 5 at% Mg has been found to contain a single phase whereas samples doped with 10 and 20 at% Mg both exhibited apparent secondary phase (MgO). Microstructural examination however, revealed that no significant variation in particle size, grain size and density were evident among the samples of different Mg contents. Average dielectric constants obtained from the entire samples ranged from 245.9 to 387.6 (at 1 MHz) and the sample with the highest dielectric constant was that doped with 5 at% Mg. Enhancement of dielectric constant in the samples with the lowest level of Mg doping has been attributed largely to the homogeneity of its chemical composition.

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Prospects for the Development of High Energy Density Dielectric Capacitors

Applied Sciences ◽

10.3390/app11178063 ◽

2021 ◽

Vol 11 (17) ◽

pp. 8063

Author(s):

Andrew Burke

Keyword(s):

Dielectric Constant ◽

Energy Density ◽

Breakdown Strength ◽

High Energy ◽

Dielectric Constants ◽

Polymer Materials ◽

High Energy Density ◽

Effective Dielectric Constant ◽

High Dielectric ◽

Very High

In this paper, the design of high energy density dielectric capacitors for energy storage in vehicle, industrial, and electric utility applications have been considered in detail. The performance of these devices depends primarily on the dielectric constant and breakdown strength characteristics of the dielectric material used. A review of the literature on composite polymer materials to assess their present dielectric constants and the various approaches being pursued to increase energy density found that there are many papers in which materials having dielectric constants of 20–50 were reported, but only a few showing materials with very high dielectric constants of 500 and greater. The very high dielectric constants were usually achieved with nanoscale metallic or carbon particles embedded in a host polymer and the maximum dielectric constant occurred near the percolation threshold particle loading. In this study, an analytical method to calculate the dielectric constant of composite dielectric polymers with various types of nanoparticles embedded is presented. The method was applied using an Excel spreadsheet to calculate the characteristics of spiral wound battery cells using various composite polymers with embedded particles. The calculated energy densities were strong functions of the size of the particles and thickness of the dielectric layer in the cell. For a 1000 V cell, an energy density of 100–200 Wh/kg was calculated for 3–5 nm particles and 3–5 µ thick dielectric layers. The results of this study indicate that dielectric materials with an effective dielectric constant of 500–1000 are needed to develop dielectric capacitor cells with battery-like energy density. The breakdown strength would be 300–400 V/µ in a reverse sandwich multilayer dielectric arrangement. The leakage current of the cell would be determined from appropriate DC testing. These high energy density dielectric capacitors are very different from electrochemical capacitors that utilize conducting polymers and liquid electrolytes and are constructed much like batteries. The dielectric capacitors have a very high cell voltage and are constructed like conventional ceramic capacitors.

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Composition-Microstructure-Property Relationships in BaTiO3 with Mg Addition

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.659.58 ◽

2015 ◽

Vol 659 ◽

pp. 58-63

Author(s):

Oratai Jongprateep ◽

Tunchanoke Khongnakhon ◽

Jednupong Palomas

Keyword(s):

Dielectric Constant ◽

Dielectric Loss ◽

Barium Titanate ◽

High Efficiency ◽

High Dielectric Constant ◽

Dielectric Materials ◽

High Energy ◽

High Energy Density ◽

Low Dielectric ◽

High Dielectric

Rising worldwide demands for energy encourages development of high-efficiency energy storage and capacitor components. Main requirements for dielectric materials employed in fabrication of high energy density capacitors include high dielectric constant, high dielectric breakdown strength, and low dielectric loss. Owing to its high dielectric constant and low dielectric loss [1], barium titanate is among common capacitor materials. Tailoring of dielectric properties of barium titanate can be achieved through controlled chemical composition, microstructure, and crystal structure. Synthesis and processing techniques, as well as doping of barium titanate, can be key factors to control the composition and structure, which consequently contribute to enhancement of dielectric constant in the material.

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Significantly enhanced dielectric constant and energy storage properties in polyimide/reduced BaTiO3composite films with excellent thermal stability

RSC Advances ◽

10.1039/c8ra10434d ◽

2019 ◽

Vol 9 (14) ◽

pp. 7706-7717 ◽

Cited By ~ 7

Author(s):

Shuangshuang Yue ◽

Baoquan Wan ◽

Yunying Liu ◽

Qiwei Zhang

Keyword(s):

Thermal Stability ◽

Dielectric Constant ◽

Energy Density ◽

Barium Titanate ◽

High Energy ◽

High Energy Density ◽

Excellent Thermal Stability ◽

Energy Storage Properties ◽

Storage Properties ◽

Semiconductor Properties

The semiconductor properties of reduced barium titanate, with a high energy density of 9.7 J cm−3.

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Ba0.9 A0.1TiO3 (A = Al and Mg) Powders Synthesized by Solid State Reaction Technique and their Dielectric Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.747.603 ◽

2013 ◽

Vol 747 ◽

pp. 603-606 ◽

Cited By ~ 1

Author(s):

Tunchanoke Khongnakhon ◽

Oratai Jongprateep

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Chemical Composition ◽

Solid State ◽

Barium Titanate ◽

Solid State Reaction ◽

Low Density ◽

Solid State Reaction Technique ◽

Synthesis Of Barium Titanate

Barium titanate has been a common material for fabrication of capacitors. Synthesis of barium titanate can be achieved by various techniques. These techniques are believed to affect dielectric properties. This research was aimed at synthesizing BaTiO3 and Ba0.9 A0.1TiO3 (A = Al and Mg) powders by solid state reaction technique. Dielectric constant of barium titanate and the ones doped with 10 at% Al and Mg prepared by the solid state reaction technique had dielectric constant ranging from 109 to 280 at 1 MHz. Results from density examination revealed that barium titanate samples prepared by the solid state reaction had low density. This may leads to the decrease of dielectric constant. Results from this study suggested that the decline of the dielectric properties was attributed to chemical composition and density of samples.

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Enhanced dielectric properties and thermostability in polyimide composites with core-shell structured polyimide@BaTiO3 nanoparticles

High Performance Polymers ◽

10.1177/0954008321993526 ◽

2021 ◽

pp. 095400832199352

Author(s):

Wei Deng ◽

Guanguan Ren ◽

Wenqi Wang ◽

Weiwei Cui ◽

Wenjun Luo

Keyword(s):

Dielectric Constant ◽

Dielectric Loss ◽

Energy Density ◽

Breakdown Strength ◽

In Situ Polymerization ◽

Dielectric Materials ◽

High Energy ◽

Amic Acid ◽

High Energy Density ◽

Core Shell

Polymer composites with high dielectric constant and thermal stability have shown great potential applications in the fields relating to the energy storage. Herein, core-shell structured polyimide@BaTiO3 (PI@BT) nanoparticles were fabricated via in-situ polymerization of poly(amic acid) (PAA) and the following thermal imidization, then utilized as fillers to prepare PI composites. Increased dielectric constant with suppressed dielectric loss, and enhanced energy density as well as heat resistance were simultaneously realized due to the presence of PI shell between BT nanoparticles and PI matrix. The dielectric constant of PI@BT/PI composites with 55 wt% fillers increased to 15.0 at 100 Hz, while the dielectric loss kept at low value of 0.0034, companied by a high energy density of 1.32 J·cm−3, which was 2.09 times higher than the pristine PI. Moreover, the temperature at 10 wt% weight loss reached 619°C, demonstrating the excellent thermostability of PI@BT/PI composites. In addition, PI@BT/PI composites exhibited improved breakdown strength and toughness as compared with the BT/PI composites due to the well dispersion of PI@BT nanofillers and the improved interfacial interactions between nanofillers and polymer matrix. These results provide useful information for the structural design of high-temperature dielectric materials.

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Epitaxial Growth and Anisotropic Dielectric Properties of La-Doped Bi4Ti3O12 Thin Films

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.124-126.177 ◽

2007 ◽

Vol 124-126 ◽

pp. 177-180

Author(s):

Jang Sik Lee ◽

Q.X. Jia

Keyword(s):

Thin Films ◽

Dielectric Constant ◽

Dielectric Properties ◽

Bottom Electrode ◽

Dielectric Constants ◽

The Other ◽

Field Range ◽

Anisotropic Dielectric ◽

Dielectric Nonlinearity ◽

La Doped

To investigate the anisotropic dielectric properties of layer-structured bismuth-based ferroelectrics along different crystal directions, we fabricate devices along different crystal orientations using highly c-axis oriented Bi3.25La0.75Ti3O12 (BLT) thin films on (001) LaAlO3 (LAO) substrates. Experimental results have shown that the dielectric properties of the BLT films are highly anisotropic along different crystal directions. The dielectric constants (1MHz at 300 K) are 358 and 160 along [100] and [110], respectively. Dielectric nonlinearity is also detected along these crystal directions. On the other hand, a much smaller dielectric constant and no detectable dielectric nonlinearity in a field range of 0-200 kV/cm are observed for films along [001] when c-axis oriented SRO is used as the bottom electrode.

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The effects of calcination and doping on structural and dielectric properties of CaCu3-xCoxTi4O12 ceramic

Mediterranean Journal of Chemistry ◽

10.13171/10.13171/mjc8319052011nh ◽

2019 ◽

Vol 8 (3) ◽

pp. 234

Author(s):

Nasr Hadi ◽

Tajdine Lamcharfi ◽

Farid Abdi ◽

Nor-Said Echtoui ◽

Ahmed Harrach ◽

...

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Complex Impedance ◽

Impedance Analysis ◽

Xrd Analysis ◽

Secondary Phases ◽

Solid State Method ◽

Complex Impedance Analysis ◽

Oxide Powders ◽

Increasing Temperature

The influences of calcination temperature and doping with cobalt in A–site on structural and dielectric properties of CaCu3-xCoxTi4O12 (CCCxTO, x = 0.00, 0.02 and 0.10) ceramics sintered at 1050 0C for 8h were investigated. The ceramic samples are prepared by the conventional solid-state method using high purity oxide powders, and they are calcined at 850 °C, 950 °C and 1050 0C for 4h. The X-ray diffraction (XRD) analysis of pure and doped CCTO samples calcined at 950 °C and 1050 0C showed no traces of any other secondary phases, while impurity phases alongside CCTO phase in the x=0.00 sample calcined at 850 0C was observed. Scanning electron microscopy (SEM) investigation showed an increase in grain size with increasing of Co content and calcining temperature. Dielectric measurements indicated that the dielectric constant of the pure CCTO calcined at 1050 0C/4h has a low value in the frequency range of 1kHz up to 1MHz, whereas the substitution of Co up to x = 0.10 into CCTO caused a huge increase in the dielectric constant value of the calcined samples which is equal to 153419 and 18957 at 950 °C and 1050 0C respectively. The complex impedance analysis of all samples shows a decrease in resistance with an increasing temperature, which suggests a semiconductor nature of the samples.

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