Characterization, Structure, Dielectric Permittivity, and AC Conductivity of Co–Ni-Doped Bentonite at Room Temperature

2021 ◽  
Author(s):  
Ali H. Bashal
Keyword(s):  
Dielectric Permittivity ◽  
Ac Conductivity ◽  
Room Temperature

AC conductivity and dielectric permittivity of TGS and urea doped TGS crystals at microwave frequency

1994 ◽  
Vol 158 (1) ◽  
pp. 87-92 ◽  
Author(s):  
S. C. Mathur ◽  
D. C. Dube ◽  
D. S. Rawat ◽  
A. S. Bhalla
Keyword(s):  
Dielectric Permittivity ◽  
Ac Conductivity ◽  
Microwave Frequency

scholarly journals Смена знака магнитоемкости в парамагнитной области в катион-замещенном селениде марганца

2018 ◽  
Vol 60 (4) ◽  
pp. 670
Author(s):  
С.С. Аплеснин ◽  
М.Н. Ситников ◽  
А.М. Живулько
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Magnetic Susceptibility ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Room Temperature ◽  
Frequency Range ◽  
Wagner Model ◽  
Paramagnetic Region ◽  
Orbital Electron

AbstractThe capacity and the dielectric loss tangent of a Gd_ x Mn_1– x Se ( x ≤ 0.2) solid solution have been measured in the frequency range 1–300 kHz without a magnetic field and in a magnetic field of 8 kOe in the temperature range 100–450 K, and the magnetic moment of the solid solution has been measured in a field of 8.6 kOe. The magnetocapacity effect and the change in the magnetocapacity sign have been observed in room temperature in the paramagnetic region. A correlation of the changes in the dielectric permittivity and the magnetic susceptibility with temperature has been revealed. The magnetocapacity is described using the model with orbital electron ordering and the Maxwell–Wagner model.

Electrical Dielectric Permittivity and Conductivity Analysis of Poly(N-Carbazole) (PVK) Blending with Polyvinylpyrrolidone (PVP)

2018 ◽  
Vol 762 ◽  
pp. 244-248
Author(s):  
Ahmad Nazib Alias ◽  
Zubainun Mohamed Zabidi ◽  
N. Ramlee ◽  
Yanti Yaacob ◽  
Siti Hajar Noor Alshurdin ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Dielectric Permittivity ◽  
Ac Conductivity ◽  
Electrochemical Impedance ◽  
Casting Method ◽  
Vacuum Oven ◽  
Correlated Barrier Hopping ◽  
Universal Power Law ◽  
Hopping Model

Electrical dielectric spectra and alternating current (ac) conductivity of blended poly (N-vinlycarbazole) (PVK) with polyvinylpyrrolidone (PVP) at different temperature are investigated. The polymer blends were prepared by dissolving in dimethylformamide (DMF) using drop casting method and further dried in vacuum oven. The dielectric and ac conductivity of each sample was investigated using electrochemical impedance spectroscopy (EIS) method. Dielectric permittivity studies revealed that there are significant changes in the spectra at different temperature. The ac conductivity was further analyzed by using universal power law. The hopping parameter was calculated by using correlated barrier hopping model.

scholarly journals Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

2016 ◽  
Vol 06 (03) ◽  
pp. 1650018 ◽  
Author(s):  
L. N. Shubha ◽  
P. Madhusudana Rao
Keyword(s):  
Dielectric Permittivity ◽  
Copper Oxide ◽  
Ac Conductivity ◽  
Morphological Changes ◽  
Copper Oxide Nanoparticles ◽  
Sem Images ◽  
Increase With Increase ◽  
Visible Spectra ◽  
Uv Visible ◽  
Lcr Meter

The polyaniline/copper oxide (PANI/CuO) nanocomposite was prepared by mixing solutions of polyaniline and copper oxide nanoparticles in dimethyl sulfoxide (DMSO). The synthesized polymer nanocomposites were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM) and UV–visible spectroscopy. The characteristic peaks in XRD and UV–visible spectra confirmed the presence of CuO in the polymer structure. SEM images indicated morphological changes in the composite matrix as compared to the pristine PANI. The DC conductivity measurements were performed using two-probe method for various temperatures. AC conductivity and dielectric response of the composites were investigated in the frequency range of [Formula: see text]–[Formula: see text][Formula: see text]Hz using LCR meter. Dielectric permittivity [Formula: see text] and dielectric loss factor [Formula: see text] were investigated. It was observed that [Formula: see text] and [Formula: see text] decrease with increase in frequency at all temperatures. At a particular frequency it is observed that both [Formula: see text] and [Formula: see text] increase with increase in temperature. It was also observed that AC conductivity increased with increase in frequency and temperature.

Dielectric Permittivity Mapping up to 9GHz Region with Non-contact Microwave Probe for Ferroelectric Device

2006 ◽  
Vol 966 ◽  
Author(s):  
Hirofumi Kakemoto ◽  
Jianyong Li ◽  
Takakiyo Harigai ◽  
Song-Min Nam ◽  
Satoshi Wada ◽  
...  
Keyword(s):  
Dielectric Permittivity ◽  
Cross Sections ◽  
High Frequency ◽  
Room Temperature ◽  
Measured Data ◽  
Data Process ◽  
Direct Observations ◽  
Ceramic Capacitor ◽  
Microwave Probe ◽  
Reflection Intensity

ABSTRACTDirect observations for high frequency microscopic dielectric distributions in cross sections of a multi-layer ceramic capacitor were carried out using non-contact type microwave probe. The measured data were imaged from the raw data and rounding data process. Using microwave reflection intensity mappings from cross sections of multi-layer ceramic capacitor, the dielectric permittivity distribution in micro-region of a multi-layer ceramic capacitor was measured at room temperature. The spatial resolution was experimentally estimated to be about 10 μm from mappings of the dielectric and inner electrode layers in a multi-layer ceramic capacitor.

Swelling of larch wood in organic liquids

Holzforschung ◽  
2008 ◽  
Vol 62 (3) ◽  
Author(s):  
Sergei R. Loskutov ◽  
Antonina A. Aniskina
Keyword(s):  
Dielectric Permittivity ◽  
Ethylene Glycol ◽  
Room Temperature ◽  
Organic Liquids ◽  
Dimethyl Formamide ◽  
Absorption Process ◽  
Larch Wood ◽  
Dipole Component ◽  
Liquid Absorption ◽  
Methyl Cellosolve

Abstract The swelling of larch wood in 1-butanol, dimethyl sulfoxide, N,N-dimethyl formamide, ethylene glycol, ethanol, methyl cellosolve, 1-propanol and toluene was investigated at room temperature. The volumetric, tangential and radial swelling completion was lagging behind the liquid absorption process. The kinetic indices of swelling of larch wood were determined based on the equation of Kolmogorov-Erofeev. The volumetric swelling was related to molecular mass, molar volume, dielectric permittivity and integral heat of wood wetting. The anisotropy of wood swelling was characterized by the ratio of equilibrium tangential swelling to radial swelling (α t,/α r). It was demonstrated that α t,/α r is related to the dipole component of Hansen's parameter and cannot exceed the value 3.

IN SITU SYNTHESIS, CHARACTERIZATION AND FREQUENCY DEPENDENT AC CONDUCTIVITY OF POLYANILINE/CoFe2O4 NANOCOMPOSITES

2011 ◽  
Vol 01 (03) ◽  
pp. 357-362 ◽  
Author(s):  
G. D. PRASANNA ◽  
H. S. JAYANNA
Keyword(s):  
Ac Conductivity ◽  
Room Temperature ◽  
In Situ Polymerization ◽  
In Situ Synthesis ◽  
Electron Micrograph ◽  
Frequency Range ◽  
X Ray Diffraction ◽  
Scanning Electron Micrograph ◽  
X Ray

The polyaniline (PANI)/ CoFe2O4 nanocomposites were prepared by an In Situ polymerization of aniline in an aqueous solution. The composites were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectrum,thermogravimetric analysis (TGA) and scanning electron micrograph (SEM). The AC conductivity and dielectric properties of these composites were investigated in the frequency range 1 kHz–10 MHz at room temperature. The AC conductivity was found to be constant up to 1 MHz and thereafter it increases steeply and it was observed maximum for the PANI with 60 wt% of CoFe2O4 nanocomposite. At lower frequencies the values of dielectric constant is maximum for pure CoFe2O4 nanoparticles.

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