scholarly journals Cobalt Alumino Silicate Ceramic(CASC) nanocomposite, a material with moderately high dielectric constant and low tangent loss at a critical concentration in high frequency range.

2015 ◽  
Author(s):  
Sukhen Das ◽  
Biplab Paul ◽  
Smarajit Manna ◽  
Debasis Roy ◽  
Papiya Nandy
Keyword(s):  
Dielectric Constant ◽  
High Frequency ◽  
High Dielectric Constant ◽  
Critical Concentration ◽  
Tangent Loss ◽  
High Frequency Range ◽  
Frequency Range ◽  
Alumino Silicate ◽  
High Dielectric ◽  
Silicate Ceramic

A new single/few-layered graphene oxide with a high dielectric constant of 106: contribution of defects and functional groups

RSC Advances ◽  
2015 ◽  
Vol 5 (19) ◽  
pp. 14768-14779 ◽  
Author(s):  
K. Santhosh Kumar ◽  
Suresh Pittala ◽  
Srinath Sanyadanam ◽  
Pradip Paik
Keyword(s):  
Dielectric Constant ◽  
Graphene Oxide ◽  
Dielectric Permittivity ◽  
Functional Groups ◽  
High Dielectric Constant ◽  
Frequency Range ◽  
Temperature Range ◽  
High Dielectric Permittivity ◽  
High Dielectric

In this study, we introduce a single/few-layered graphene oxide (GO) synthesized with ultrasonication, and demonstrate its high dielectric permittivity in the frequency range of 20 Hz to 2 MHz and temperature range of 30 °C to 180 °C.

Achieving Ceramic-like RF Capacitor Requirements with Organic-based Materials

2010 ◽  
Vol 2010 (1) ◽  
pp. 000072-000075 ◽  
Author(s):  
Jin-Hyun Hwang ◽  
John Andresakis ◽  
Bob Carter ◽  
Yuji Kageyama ◽  
Fujio Kuwako
Keyword(s):  
Dielectric Constant ◽  
Form Factor ◽  
High Dielectric Constant ◽  
High Volume ◽  
Electrical Performance ◽  
Frequency Range ◽  
Large Area ◽  
Low Loss ◽  
Capacitance Variation ◽  
High Dielectric

New and novel organic-based composite materials for the use of embedded RF capacitors have been developed to address the important material issues by means of functional filler and resin chemistry. Combining different fillers with appropriate chemistries, the net composite can be made thermally stable while retaining the high dielectric constant and low loss. These composites attained dielectric constant of above 7 without compromising the quality factor in GHz frequency range. In addition, measurement of capacitance variation as a function of temperature (TCC) showed flatter TCC profile, resulting in TCC of ±30 ppm/°C over the temperature range −55°C to 125°C. It can be incorporated into organic chip package and, unlike ceramic-based LTCC they can utilize large area processing that is typical, and available in high volume manufacturing. This material is formulated for RF module designers to successfully implement embedded RF capacitors into their organic chip package designs and thus improve form factor, electrical performance and possibly reduce overall costs.

Graphene–Epoxy Composites with High Dielectric Constant Prepared by Cryomilling

2015 ◽  
Vol 815 ◽  
pp. 611-615 ◽  
Author(s):  
Qing Hou ◽  
Run Hua Fan ◽  
Zi Dong Zhang ◽  
Ke Lan Yan ◽  
Chuan Bing Cheng ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Frequency Dispersion ◽  
Liquid Nitrogen Temperature ◽  
Epoxy Composites ◽  
Frequency Range ◽  
Testing Frequency ◽  
High Dielectric ◽  
Conductive Mechanism ◽  
Jonscher’S Power Law

The microstructure and dielectric properties of the graphene–epoxy composites prepared by cryomilling at liquid nitrogen temperature were studied by SEM and RF impedance material analyzer. The result indicated that both the dielectric constant and conductivity of the composites increased with the increase of the graphene content. The value of the dielectric constant of the composite with about 8 wt % of graphene was as high as 200. Moreover, the frequency dispersion behaviors of the conductivity within a certain frequency range accorded with the Jonscher's power law demonstrating that the conductive mechanism is hopping conduction. The negative reactance decreased with the increase of the testing frequency which indicated a capacitive character

Dielectric Properties of Al2O3/CaCu3Ti4O12 Composite at High Frequency Range

2017 ◽  
Vol 888 ◽  
pp. 7-11
Author(s):  
Rosyaini Afindi Zaman ◽  
Mohamad Johari Abu ◽  
Mohd Fariz Ab Rahman ◽  
Wan Fahmin Faiz Wan Ali ◽  
Julie Juliewatty Mohamed ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
High Frequency ◽  
Great Influence ◽  
Secondary Phase ◽  
Xrd Analysis ◽  
Calcium Titanate ◽  
Tangent Loss ◽  
High Frequency Range ◽  
Secondary Phases ◽  
Frequency Range

The dielectric properties of CCTO with addition Al2O3 prepared via solid state reaction investigated and reported at 1 GHz. With addition Al2O3 from 20 wt% to 80 wt%, secondary phase starts appear in XRD analysis such as copper dialuminium oxide (CuAl2O4), calcium titanate (CaTiO3) and titanium oxide (TiO2). These secondary phases show great influence on morphology and grain size of Al2O3/ CCTO composites. Hence, the addition of only 20 wt% Al2O3, the dielectric constant of CCTO reduce almost 50% and tangent loss is in between 0.0028 to 0.0630 which is very low and this characterization is suitable to use in electronic application in high frequency range.

Impedance and Dielectric Properties of PANI/V2O5 Nano Composites

2017 ◽  
Vol 6 (1) ◽  
pp. 76-79
Author(s):  
B. Chakradhar Sridhar ◽  
M. V. N. Ambika Prasad
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Relaxation Mechanism ◽  
Single Step ◽  
Nano Composites ◽  
Frequency Range ◽  
Conducting Polyaniline ◽  
High Dielectric ◽  
Technological Interest

The conducting Polyaniline/Vanadium Pentoxide (PANI/V2O5) composites were synthesized by single step in situ polymerization technique with 10, 20, 30, 40 and 50 wt% of V2O5 in polyaniline. The composites thus formed were characterized by Fourier infrared spectroscopy (FTIR), which confirmed the presence of V2O5 in polyaniline matrix and the formation of the composite. The AC conductivity has been studied in the frequency range of 50 Hz to 1 MHz and it is found that 40 wt% shows high conductivity compare to pure polyaniline and other composites. The high dielectric constant, which is related to polarization. It is seen that both dielectric constant and dielectric loss decrease with increase in frequency. The variation of impedance as a function of frequency suggesting nearly Debye-type relaxation mechanism. The results obtained for these composites are of scientific and technological interest.

scholarly journals Влияние химического состава кристаллов TlIn-=SUB=-1-x-=/SUB=-Er-=SUB=-x-=/SUB=-S-=SUB=-2-=/SUB=- (0≤ x≤0.01) на их диэлектрические характеристики и параметры локализованных состояний

2019 ◽  
Vol 61 (11) ◽  
pp. 2030
Author(s):  
С.Н. Мустафаева ◽  
М.М. Асадов
Keyword(s):  
Dielectric Constant ◽  
Charge Transfer ◽  
Chemical Composition ◽  
High Frequency ◽  
Ac Conductivity ◽  
Relaxation Dispersion ◽  
Complex Dielectric Constant ◽  
High Frequency Range ◽  
Frequency Range ◽  
Frequency Dependences

The frequency dependences of the real (ε) and imaginary (ε ″) components of the complex dielectric constant, tangent of dielectric loss (tan) and ac conductivity (σac) of the obtained TlIn1-хErхS2 (0  x  0.01) crystals have been studied in the frequency range f = 5104–3.5107 Hz. It is established that in TlIn1-хErхS2 a relaxation dispersion of ε and ε″ takes place. The effect of erbium concentration (Er) in TlIn1-хErхS2 crystals on their dielectric coefficients was studied. In the high frequency range, the ac conductivity of TlIn1-хErхS2 crystals obeyed the σac ~ f 0.8 law, which is characteristic of a hopping charge transfer mechanism at states localized near the Fermi level. The parameters of states localized in the band gap and the influence of the chemical composition of the TlIn1-хErхS2 crystals on these parameters are estimated.

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