scholarly journals Enhanced Dielectric Permittivity of Optimized Surface Modified of Barium Titanate Nanocomposites

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 827 ◽  
Author(s):  
Udhay Sundar ◽  
Zichen Lao ◽  
Kimberly Cook-Chennault
Keyword(s):  
Barium Titanate ◽  
Dielectric Permittivity ◽  
Particle Surface ◽  
Ceramic Particle ◽  
Dielectric Films ◽  
Filler Concentration ◽  
Energy Storage Devices ◽  
Electrostatic And Steric Stabilization ◽  
Ceramic Fillers ◽  
Surface Modified

High permittivity polymer-ceramic nanocomposite dielectric films take advantage of the ease of flexibility in processing of polymers and the functionality of electroactive ceramic fillers. Hence, films like these may be applied to embedded energy storage devices for printed circuit electrical boards. However, the incompatibility of the hydrophilic ceramic filler and hydrophobic epoxy limit the filler concentration and therefore, dielectric permittivity of these materials. Traditionally, surfactants and core-shell processing of ceramic fillers are used to achieve electrostatic and steric stabilization for adequate ceramic particle distribution but, questions regarding these processes still remain. The purpose of this work is to understand the role of surfactant concentration ceramic particle surface morphology, and composite dielectric permittivity and conductivity. A comprehensive study of barium titanate-based epoxy nanocomposites was performed. Ethanol and 3-glycidyloxypropyltrimethoxysilan surface treatments were performed, where the best reduction in particle agglomeration, highest value of permittivity and the lowest value of loss were observed. The results demonstrate that optimization of coupling agent may lead to superior permittivity values and diminished losses that are ~2–3 times that of composites with non-optimized and traditional surfactant treatments.

scholarly journals Investigation of Piezoelectricity and Resistivity of Surface Modified Barium Titanate Nanocomposites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2123 ◽  
Author(s):  
Udhay Sundar ◽  
Zichen Lao ◽  
Kimberly Cook-Chennault
Keyword(s):  
Barium Titanate ◽  
Particle Surface ◽  
Dielectric Films ◽  
Filler Concentration ◽  
Ceramic Filler ◽  
Energy Storage Devices ◽  
Storage Devices ◽  
Interfacial Layers ◽  
Piezoelectric Strain ◽  
Surface Modified

Polymer-ceramic nanocomposite piezoelectric and dielectric films are of interest because of their possible application to advanced embedded energy storage devices for printed wired electrical boards. The incompatibility of the two constituent materials; hydrophilic ceramic filler, and hydrophobic epoxy limit the filler concentration, and thus, their piezoelectric properties. This work aims to understand the role of surfactant concentration in establishing meaningful interfacial layers between the epoxy and ceramic filler particles by observing particle surface morphology, piezoelectric strain coefficients, and resistivity spectra. A comprehensive study of nanocomposites, comprising non-treated and surface treated barium titanate (BTO), embedded within an epoxy matrix, was performed. The surface treatments were performed with two types of coupling agents: Ethanol and 3-glycidyloxypropyltrimethoxysilan. The observations of particle agglomeration, piezoelectric strain coefficients, and resistivity were compared, where the most ideal properties were found for concentrations of 0.02 and 0.025. This work demonstrates that the interfacial core-shell processing layer concentration influences the macroscopic properties of nanocomposites, and the opportunities for tuning interfacial layers for desirable characteristics of specific applications.

scholarly journals ELECTRODELESS MEASUREMENT TECHNIQUE OF COMPLEX DIELECTRIC PERMITTIVITY OF HIGH-K DIELECTRIC FILMS IN THE MILLIMETER WAVELENGTH RANGE

2016 ◽  
Vol 52 ◽  
pp. 161-167 ◽  
Author(s):  
Igor V. Kotelnikov ◽  
Andrey G. Altynnikov ◽  
Anatoly Konstantinovich Mikhailov ◽  
Valentina V. Medvedeva ◽  
Andrey Kozyrev
Keyword(s):  
Dielectric Permittivity ◽  
Wavelength Range ◽  
Measurement Technique ◽  
Complex Dielectric Permittivity ◽  
Dielectric Films ◽  
Millimeter Wavelength ◽  
High K ◽  
High K Dielectric

Quantifying dielectric and microwave absorption properties of barium titanate and strontium ferrite filled polymer composites

2020 ◽  
pp. 096739112096750
Author(s):  
Alper Kasgoz
Keyword(s):  
Barium Titanate ◽  
Microwave Absorption ◽  
Power Law ◽  
Hybrid Composites ◽  
Thermoplastic Polyurethane ◽  
Strontium Ferrite ◽  
Filler Concentration ◽  
Power Law Model ◽  
Dielectric Parameters ◽  
Composite Samples

In the present study, dielectric and microwave absorbing properties of barium titanate (BaTiO3) and strontium ferrite (SrFe12O19) filled thermoplastic polyurethane composites were investigated. The variations of the dielectric parameters of the BaTiO3 filled composite samples with filler concentration were also modeled and simulated by the power-law model to predict dielectric coefficients of the samples for higher filler concentrations. Comparing the prediction of the Power-law model and experimental measured dielectric values indicate that the Power-law model predicts dielectric parameters of the composite with acceptable accuracy. Microwave absorption analyses of the composite samples showed that SrFe12O19 is more effective than BaTiO3 on the enhancement of microwave absorption capability of TPU. The hybrid composite samples that contained both SrFe12O19 and BaTiO3 were also prepared, and their microwave absorption performance was evaluated. It was observed that much lower RL values than that of the composite samples, which were filled SrFe12O19 or BaTiO3 could be obtained by the hybrid composites. However, absorption bandwidth of them was narrower than counterparts that contained the same amount of SrFe12O19.

Development of Poly(dimethylsiloxane)/BaTiO3 Nanocomposites as Dielectric Material

2012 ◽  
Vol 622-623 ◽  
pp. 897-900 ◽  
Author(s):  
Suryakanta Nayak ◽  
Tapan Kumar Chaki ◽  
Dipak Khastgir
Keyword(s):  
Mechanical Properties ◽  
Dielectric Constant ◽  
Electron Microscope ◽  
Barium Titanate ◽  
Dielectric Material ◽  
Volume Resistivity ◽  
Filler Concentration ◽  
Base Matrix ◽  
Batio3 Nanoparticles ◽  
Scanning Electron

Polymer-ceramic nanocomposites with controlled dielectric properties are prepared using poly(dimethylsiloxane) elastomer as base matrix and barium titanate as filler. Barium titanate (BaTiO3) used in this study is prepared by solid state reaction at high temperature. The effect of BaTiO3 nanoparticles on electrical and mechanical properties are extensively studied and found that dielectric constant of nanocomposites increases significantly with the increase in BaTiO3 concentration where as volume resistivity decreases continuously. Different mechanical properties are also studied for all the composites in order to find the effect of filler concentration. Morphology of the prepared BaTiO3 was studied by field emission scanning electron microscope (FESEM).

scholarly journals Synthesis and Characterization of Low Loss Dielectric Ceramics Prepared from Composite of Titanate Nanosheets with Barium Ions

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Aleksandra Wypych-Puszkarz ◽  
Izabela Bobowska ◽  
Angelika Wrzesinska ◽  
Agnieszka Opasinska ◽  
Waldemar Maniukiewicz ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Dielectric Permittivity ◽  
Xrd Analysis ◽  
Barium Ions ◽  
Nanometric Range ◽  
Mean Size ◽  
Titanate Ceramics ◽  
Titanate Nanosheets

We report a strategy for preparing barium titanate precursor, being the composite of titanate nanosheets (TN) with barium ions (Ba-TN), which subjected to step sintering allows obtaining TiO2 rich barium titanate ceramics of stoichiometry BaTi4O9 or Ba2Ti9O20. These compounds are important in modern electronics due to their required dielectric properties and grains’ size that can be preserved in nanometric range. The morphology studies, structural characterization, and dielectric investigations were performed simultaneously in each step of Ba-TN calcinations in order to properly characterize type of obtained ceramic, its grains’ morphology, and dielectric properties. The Ba-TN precursor can be sintered at given temperatures, so that its dielectric permittivity can be tuned between 25 and 42 with controlled temperature coefficients that change from negative 32 ppm/°C for Ba-TN sintered at 900°C up to positive 37 ppm/°C after calcination at 1300°C. XRD analysis and Raman investigations performed for the Ba-TN in the temperature range of 900÷1250°C showed that below 1100°C we obtained as a main phase BaTi4O9, whereas the higher calcinations temperature transformed Ba-TN into Ba2Ti9O20. Taking into account trend of device miniaturization and nanoscopic size requirements, temperatures of 900°C and 1100°C seem to be an optimal condition for Ba-TN precursor calcinations that guarantee the satisfactory value of dielectric permittivity (ε=26 and 32) and ceramic grains with a mean size of ~180 nm and ~550 nm, respectively.

scholarly journals A Study on the Dielectric Behaviour of Epoxy/Hafnium Oxide Nanopowder Composites

2011 ◽  
Vol 20 (5) ◽  
pp. 096369351102000 ◽  
Author(s):  
S.N. Georga
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Permittivity ◽  
High Temperatures ◽  
High Frequency ◽  
Dielectric Response ◽  
Hafnium Oxide ◽  
Filler Concentration ◽  
High Frequency Range ◽  
Frequency Range ◽  
Low Frequencies

The dielectric response of 10 and 15phr epoxy/HfO2 nanocomposite systems has been studied in a wide frequency and temperature range. The experimental results show an enhancement of the dielectric permittivity with increasing filler concentration. The dielectric spectra reveal the presence of α-relaxation and a weak MWS effect. In the high frequency range the real part of the electrical conductivity obeys the Universal Dielectric Response (UDR), whereas at low frequencies and high temperatures DC conductivity is observed. VFT (Vogel-Fulcher-Tamann) parameters are calculated for all measured specimens.

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