scholarly journals The Effect of PVA Binder Solvent Composition on the Microstructure and Electrical Properties of 0.98BaTiO3-0.02(Ba0.5Ca0.5)SiO3 Doped with Dy2O3

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2067
Author(s):  
Nak-Beom Jo ◽  
Jin-Seok Baek ◽  
Eung-Soo Kim
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Structural Characteristics ◽  
Dissipation Factor ◽  
Solvent Composition ◽  
Microstructural Characteristics ◽  
Homogeneous Microstructure ◽  
Maximum Dielectric Constant ◽  
Alcohol Water ◽  
Crystal Structural

In this study, the effect of the polyvinyl alcohol (PVA) binder solvent composition on the electrical properties of sintered 0.98BaTiO3-0.02(Ba0.5Ca0.5)SiO3 ceramics doped with x wt.% Dy2O3 (0.0 ≤ x ≤ 0.3) was investigated. In the absence of the PVA binder, the specimens sintered at 1260 and 1320 °C for 1 h in a reducing atmosphere showed a single BaTiO3 phase with the perovskite structure. The relative densities of the specimens were higher than 90%, and the grain morphologies were uniform for all the solvent compositions. At 1 kHz, the dielectric constant of the specimens depended not only on their crystal structural characteristics, but also on their microstructural characteristics. The microstructural characteristics of the specimens with the PVA binder were affected by the ethyl alcohol:water ratio of the 10 wt.% PVA-111 solution. A homogeneous microstructure was observed for the 0.1 wt.% Dy2O3-doped specimens sintered at 1320 °C for 1 h when the ethyl alcohol/water ratio of the binder solution was 40/60. These specimens showed the maximum dielectric constant (εr = 2723.3) and an insulation resistance of 270 GΩ. The relationships between the microstructural characteristics and dissipation factor (tanδ) of the specimens were also investigated.

The Role of Niobium in (Ca, Si, Ce, Nb)-Doped TiO2 Varistors

2007 ◽  
Vol 280-283 ◽  
pp. 297-300 ◽  
Author(s):  
Shao Hua Luo ◽  
Zi Long Tang ◽  
Hong Yun Li ◽  
Zhong Tai Zhang ◽  
Xi Zhou Xiong
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Room Temperature ◽  
Structural Characteristics ◽  
Nonlinear Coefficient ◽  
The Other ◽  
Optimal Composition ◽  
Low Loss ◽  
Nb Addition

The present work attempted to investigate the effect of Nb addition on the electrical properties of the (Ca,Si,Ce,Nb)-doped TiO2 ceramics. The content of added niobium is in the range 0.1-1.0mol %, while that of the other additives keeps constant. The results showed that an optimal composition doped with 0.8mol% Nb2O5, followed by sintering at 1350°C, was obtained with low V1 mA of 7.22V, high nonlinear coefficient of 5.76, ultrahigh dielectric constant (er = 86000) as well as relatively low loss (tgd = 0.52) in room temperature at 1 kHz. SEM studies show that change of niobium had significant influence on grain growth and micro structural characteristics of the sintered samples.

Effects of Fillers on Electrical Properties of PTFE Composites for Circuit Breaker

2007 ◽  
Vol 539-543 ◽  
pp. 1038-1042 ◽  
Author(s):  
Hoy Yul Park ◽  
Dong Pil Kang ◽  
Myeong Sang Ahn ◽  
Hee Woong Lee ◽  
Seog Young Yoon ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electrical Resistivity ◽  
Electrical Properties ◽  
Circuit Breaker ◽  
Dielectric Strength ◽  
Dissipation Factor ◽  
Ptfe Composites ◽  
Corona Resistance

This paper presents the effects of fillers on electrical properties of PTFE composites for nozzle of circuit breaker. PTFE has been used widely as a material for circuit breaker nozzle. Adding some filler into PTFE material is expected to be efficient for improving the endurance against arc radiation. In this experiment, effects of fillers on electrical properties such as dielectric constant, dissipation factor, electrical resistivity, dielectric strength and corona resistance of PTFE composites were investigated.

Preparation and Electrical Properties of Ba0.85Sr0.15Ti0.90Zr0.10O3 Ceramics Doped Sn by Seed-Induced Method

2015 ◽  
Vol 804 ◽  
pp. 80-83
Author(s):  
Krit Sutjarittangtham ◽  
Sukum Eitssayeam ◽  
Uraiwan Intatha ◽  
Wilaiwan Leenakul
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dielectric Constant ◽  
Electrical Properties ◽  
Powder Diffraction ◽  
Molten Salt Method ◽  
X Ray ◽  
Eutectic Mixtures ◽  
Maximum Dielectric Constant ◽  
Scanning Electron

Ba0.85Sr0.15Ti0.90Zr0.10O3 (BSZT) ceramics doped Sn was prepared by seed-induced method. The seed was prepared by molten salt method, NaCl-KCl (1:1 by mole) eutectic mixtures was used as the flux. The BSZT added seed with doped SnO were calcined at 1250 °C for 3 hrs and sintered at 1400 °C for 2 hrs, respectively. The phase formation and morphology of these samples were characterized via X-ray powder diffraction and scanning electron microscopy, respectively. From the above studies, it has been concluded that the maximum dielectric constant is 19147 at BSZT ceramics prepared by seed-induce method.

Effects of thermal annealing on the dielectric properties of Pb(Zn1/3Nb2/3)O3-based ceramics

1999 ◽  
Vol 14 (5) ◽  
pp. 1683-1685 ◽  
Author(s):  
Feng Xia ◽  
Xi Yao
Keyword(s):  
Dielectric Constant ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
Thermal Annealing ◽  
Wall Motion ◽  
Relative Dielectric Constant ◽  
Domain Wall Motion ◽  
Dissipation Factor ◽  
Diffusion Factor ◽  
Maximum Dielectric Constant

Pb(Zn1/3Nb2/3)O3-based ceramics were thermally annealed at 700–900 °C for 4 h. Both the relative dielectric constant and dissipation factor in the vicinity of transition temperature were increased when the specimens were thermally annealed at 700–900 °C, but the diffusion factor was decreased. After thermal annealing, the maximum dielectric constant Km was increased from about 11,000 to 26,000. These phenomena can be related to the domain wall motion and the elimination of internal stress.

Dielectric Properties of Importance in Operations of Post-harvest of Sorghum

2017 ◽  
Vol 13 (4) ◽  
Author(s):  
Caciano P. Z. Noreña ◽  
Carlos E. Lescano-Anadón
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Dielectric Loss ◽  
Moisture Content ◽  
Loss Factor ◽  
Dissipation Factor ◽  
Post Harvest ◽  
Moisture Contents ◽  
And Storage

Abstract The knowledge of electrical properties and their relationship with moisture content is of great importance in operations of post-harvest and storage in grains. The dielectric properties of sorghum samples were studied at different moisture contents and temperatures (25 at 41 °C), at frequencies of 1 and 10 kHz. In order to measure changes in the capacitance and dissipation factor of the samples, the method of impedance bridge was used. Both the dielectric constant and the dielectric loss factor of the samples increased with increasing moisture content and temperature; however, they decreased with increasing frequency. Models were proposed to relate the dielectric properties to either the moisture (exponential and polynomial) or temperature (linear).

scholarly journals Factors that affects the dielectric properties of natural fibre reinforced hybrid biocomposite

2019 ◽  
Vol 15 (2) ◽  
pp. 714
Author(s):  
Nishanthi Sunthrasakaran ◽  
Nor Akmal Mohd Jamail ◽  
Rahisham Abd. Rahman ◽  
Md Nor Ramdon Bin Baharom ◽  
Qamarul Ezani Kamarudin ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Loss Factor ◽  
Moisture Absorption ◽  
Dissipation Factor ◽  
Alkaline Treatment ◽  
Natural Fibre ◽  
Fibre Content ◽  
Almost All ◽  
Hybrid Biocomposite

<span>Almost all research on natural fibre reinforced composite has focused on the mechanical properties of the composite. Drawing on the important factors that effect the end product of composite, this paper reviews electrical properties of hybrid biocomposite when fibre content and surface treatment is varied. The compilation of dielectric constant, dissipation factor, loss factor and moisture absorption reported by researchers has been presented in this paper. The intrinsic characteristic of natural fibre which is hydrophilic is the main drawback that affects the electrical properties of the composite. Alkaline treatment on natural fibre has proven to overcome the hydrophilic characteristic and improves the adhesion between matrix and fibre. Besides that, the percentage of fibre content plays an important role in producing a good natural fibre reinforced hybrid composite. The moisture uptake, dielectric constant, dissipation factor and loss factor of the composite decreases with decreased fibre content.</span>

Binary HfO2: SiO2 used as High-k Gate Oxide Material in Combinatorial Material Library Method

2005 ◽  
Vol 894 ◽  
Author(s):  
Wen-Hsuan Chao ◽  
Lih-Ping Wang ◽  
Shu-Huei Wang ◽  
Tien-Heng Huang ◽  
Ren-Jen Wu ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Leakage Current ◽  
Structural Characteristics ◽  
Rf Sputtering ◽  
Oxide Semiconductor ◽  
Oxide Material ◽  
Gate Oxides ◽  
Low Leakage ◽  
Low Leakage Current

AbstractHafnium silicates (HfO2:SiO2, HSO) have recently attracted much interest in the fields of fundamental science and technology because they have high dielectric constant and low leakage current. The structure and properties of HSO gate oxides were studied using a combinatorial continuous-compositional-spread method. HSO material libraries were synthesized on a 4-inch wafer at room temperature and at 200°C using a custom-built radio-frequency (RF) sputtering system. The electrical properties of HSO material libraries were measured using metal-oxide-semiconductor structure. X-ray diffraction (XRD) was utilized to characterize the structure and compositions of HSO material libraries. The effects of sputtering conditions on the properties of the HSO gate oxides were investigated. The dielectrics constants (εr) of HSO material libraries treated with rapid thermal annealing (600°C/1min/N2) were in the range 5∼23, as determined by C-V measurement, and the dielectric constant was observed to increase with HfO2 content. The I-V relations of the HSO material libraries indicate that the leakage current decreases as the amount of Si in the HSO films increases. The structural characteristics of HSO films with RTA treatment (1000°C/10sec/N2) varied from the amorphous to the crystalline state (tetragonal and monoclinic phase), according to the composition of material libraries. The correlation among the electrical properties, the composition and the crystal structure of the HSO films is discussed.

Electrical Behavior of Probertite by Dielectric Spectroscopy

2014 ◽  
Vol 33 (6) ◽  
pp. 545-552 ◽  
Author(s):  
M. Okutan ◽  
Z. Yalçın ◽  
O. İçelli ◽  
F. Ay ◽  
R. Boncukçuoğlu ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electrical Properties ◽  
Temperature Dependence ◽  
Imaginary Part ◽  
Dielectric Spectroscopy ◽  
Dissipation Factor ◽  
Dielectric Parameter ◽  
Electrical Behavior ◽  
Electrical Parameters ◽  
Electromagnetic Absorption

AbstractIn this work of the material investigation, electrical parameters, which are real part and imaginary part of modulus, dielectric constant, dissipation factor, and conductivity, in the bulk pellet of probertite sample is presented. Electrical properties were investigated via temperature and frequency dependent dielectric spectroscopy. Real and imaginary part of dielectric parameter properties of the probertite were measured at frequencies from 100 to 15M Hz in the temperature range of 25 to 150 °C. Temperature dependence of the real part of the dielectric constant suggests that these compounds exhibit strong electromagnetic absorption and broadband electrical behavior.

scholarly journals STUDY OF EFFECT Al2O3 NANOPARTICLES ON ELECTRICAL PROPERTIES OF EPOXY REINFORCEMENT BY CARBON FIBERS HYBRID COMPOSITES

2019 ◽  
Vol 7 (9) ◽  
pp. 395-401
Author(s):  
W. Y. Khdair ◽  
S. A. Salman ◽  
Z. T. Khdair
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Constant ◽  
Electrical Properties ◽  
Carbon Fibers ◽  
Hybrid Composites ◽  
Dissipation Factor ◽  
Alumina Nanoparticles ◽  
Al2o3 Nanoparticles ◽  
Volume Fractions ◽  
Composite Samples

In this paper was investigation the electrical properties of the epoxy "Hybrid Composites" as a function of a frequency. The composites constituents were epoxy using a matrix with reinforcement ratio (1:3) and volume fractions as (25% wt). The "Hybrid  Composite" samples  were prepared by addition alumina  nanoparticles on the epoxy composites reinforced by carbon  fibers with different  volume fractions (0.1,0.3,0.5,0.7)w%  by "Hand Lay-Up Molding". The experiments were performed to measure the electrical properties "Dielectric Constant, Dissipation Factor and Electrical Conductivity" in frequency range (10Hz-1MHz). The study showed that  the reinforcement process resulted in an increase in the dielectric constant values of all manufactured models, and the addition of alumina nanoparticles leads to a decrease in the values of both the dielectric constant and the dielectric loss factor with increasing frequency and for all samples and for all values listed. Alternating electrical conductivity values increase significantly with increasing frequency and for all samples when alumina nanoparticles are added.

scholarly journals Dielectric and Ferroelectric Properties of Lead-Free[1-z{(Bi1-xLax)0.5(Na1-yLiy)0.5TiO3}-zBaTiO3]Ceramic System

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Vijayeta Pal ◽  
R. K. Dwivedi ◽  
O. P. Thakur
Keyword(s):  
Dielectric Constant ◽  
Ferroelectric Properties ◽  
Dissipation Factor ◽  
Lead Free ◽  
Rhombohedral Structure ◽  
Nonlinear Behaviour ◽  
Ceramic System ◽  
Low Dielectric ◽  
Maximum Dielectric Constant ◽  
Xrd Patterns

Lead-free specimens of [1-z{(Bi1-xLax)0.5(Na1-yLiy)0.5TiO3}-zBaTiO3] (BLNLT-BT, wherex=0.04,y=0.025, andz=0, 0.02, 0.04, and 0.06) ceramic system were synthesized by a semiwet technique. In the present study, we have investigated the effect of Ba on the structure, morphology, and dielectric, ferroelectric, and piezoelectric properties of BLNLT system. The XRD patterns of all the specimens showed rhombohedral structure at room temperature. Field emission scanning electron microscopy images (FE-SEM) showed grain growth inhibition with Ba content in BLNLT system. The temperature dependence of dielectric constant revealed that the temperature of maximum dielectric constant “Tm” and depolarization temperature “Td” decreased for the samplez=0.06and showed high value of dielectric constant with low dielectric loss. These samples exhibited nonlinear behaviour of hysteresis loop. The values of dielectric constant (εr), dissipation factor (tan δ), piezo charge coefficient (d33), remnant polarization (Pr), and coercive field (Ec) for the compositionz=0.06were 1495, 0.06, 20 pC/N, 5 μC/cm2, and 10.5 kV/cm, respectively.

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