scholarly journals Electrical conductivity and dielectric behaviour of nanocrystalline La0.6Gd0.1Sr0.3Mn0.75Si0.25O3

RSC Advances ◽  
2018 ◽  
Vol 8 (17) ◽  
pp. 9103-9111 ◽  
Author(s):  
Ah Dhahri ◽  
E. Dhahri ◽  
E. K. Hlil
Keyword(s):  
Electrical Conductivity ◽  
Equivalent Circuit ◽  
Complex Impedance ◽  
Impedance Spectrum ◽  
Dielectric Behaviour ◽  
Complex Impedance Spectrum ◽  
Electrical Equivalent Circuit ◽  
Different Temperatures

A complex impedance spectrum for La0.6Gd0.1Sr0.3Mn0.75Si0.25O3 sample at different temperatures with electrical equivalent circuit.

scholarly journals Frequency and temperature dependence behaviour of impedance, modulus and conductivity of BaBi4Ti4O15 aurivillius ceramic

2014 ◽  
Vol 8 (3) ◽  
pp. 145-153 ◽  
Author(s):  
Tanmaya Badapanda ◽  
Ranjan Harichandan ◽  
Sudhasu Nayak ◽  
Avinna Mishra ◽  
Sahid Anwar
Keyword(s):  
Relaxation Times ◽  
Complex Impedance ◽  
Negative Temperature ◽  
Impedance Spectrum ◽  
Nyquist Plot ◽  
Dielectric Study ◽  
Complex Impedance Spectrum ◽  
Debye Relaxation ◽  
Positive Side ◽  
Different Temperatures

In this work, we report the dielectric, impedance, modulus and conductivity study of BaBi4Ti4O15 ceramic synthesized by solid state reaction. X-ray diffraction (XRD) pattern showed orthorhombic structure with space group A21am confirming it to be an m=4 member of the Aurivillius oxide. The frequency dependence dielectric study shows that the value of dielectric constant is high at lower frequencies and decreases with increase in frequency. Impedance spectroscopy analyses reveal a non-Debye relaxation phenomenon since relaxation frequency moves towards the positive side with increase in temperature. The shift in impedance peaks towards higher frequency side indicates conduction in material and favouring of the long rangemotion of mobile charge carriers. The Nyquist plot from complex impedance spectrum shows only one semicircular arc representing the grain effect in the electrical conduction. The modulus mechanism indicates the non-Debye type of conductivity relaxation in the material, which is supported by impedance data. Relaxation times extracted using imaginary part of complex impedance (Z??) and modulus (M??) were also found to follow Arrhenius law. The frequency dependent AC conductivity at different temperatures indicates that the conduction process is thermally activated. The variation of DC conductivity exhibits a negative temperature coefficient of resistance behaviour.

scholarly journals Микроволновая вольт-импедансная спектроскопия полупроводников

2020 ◽  
Vol 90 (11) ◽  
pp. 1944
Author(s):  
А.Н. Резник ◽  
Н.В. Востоков ◽  
Н.К. Вдовичева ◽  
В.И. Шашкин
Keyword(s):  
Electrical Potential ◽  
Complex Impedance ◽  
Impedance Spectrum ◽  
Antenna System ◽  
Electrical Potential Difference ◽  
Complex Impedance Spectrum ◽  
Homogeneous Sample ◽  
Semiconductor Interface ◽  
Constant Bias ◽  
Central Disk

We have tested experimentally the proposed method of microwave volt-impedance spectroscopy of semiconductors. The method allows to determine the local values of the semiconductor electrophysical parameters. The studies were performed on a homogeneous single-crystal GaAs wafer with a concentric antenna system formed on its surface. The resolution is determined by the diameter of the antenna central disk, which was amounted a = 12, 27, 57 μm. A constant bias voltage of 0 ≤ U ≤ 5 V was applied between the contact pads of the antennas. The complex impedance spectrum Z (f, U) of each antenna was measured using a Cascade Microtech probe station in the frequency range f = 0.1 - 10 GHz. The electrophysical characteristics of the semiconductor were determined from Z(f, U) spectra by the inverse problem solving. We have established the n-type for our semiconductor and determined the electrical potential difference on the metal-semiconductor interface. We have found as well the electron concentration, mobility and conductivity. Measurements of the same parameters by Hall four-probe method (giving the surface averaging) showed good mutual agreement of the results for the homogeneous sample under study.

scholarly journals IMPEDANCE SPECTROSCOPY STUDY OF BIS(2-AMINO-6-METHYLPYRIDINIUM) TETRACHLORIDOZINCATE

2012 ◽  
Vol 02 (04) ◽  
pp. 1250025 ◽  
Author(s):  
A. OUESLATI ◽  
M. HAMDI ◽  
I. CHAABANE ◽  
F. HLEL ◽  
M. GARGOURI
Keyword(s):  
Activation Energy ◽  
Complex Impedance ◽  
Bulk Resistance ◽  
Electrical Equivalent Circuit ◽  
Compound C ◽  
Dielectric Data ◽  
Impedance Spectroscopy Study ◽  
Different Temperatures ◽  
Constant Phase Elements ◽  
Modified Power Law

The complex impedance of the bis(2-amino-6-methylpyridine) tetrachloridozincate compound (C6H9N2)2ZnCl4 has been investigated in the temperature range 313–403 K and in the frequency range 200 Hz–5 MHz. The impedance plots show semicircle arcs at different temperatures and an electrical equivalent circuit has been proposed to explain the impedance results. The circuits consist of the parallel combination of bulk resistance Rp and constant phase elements (CPE). The bulk resistance of the material decreases with rise in temperature. dc conduction activation energies are estimated from Arrhenius plots. The frequency-dependent conductivity data are fitted in the modified power law: σ ac (ω) = σ dc + A1ωs1 + A2ωs2. Dielectric data were analyzed using complex electrical modulus M* at various temperatures. The modulus plot can be characterized by full width at half height or by β values of Kohlrausch–William–Watts (KWW) function. Activation energy of hopping is almost close to the activation energy of conduction suggesting a hopping transport mechanism.

ELECTRICAL AND DIELECTRIC PROPERTIES OF C7H12N2[H2PO4]2 ⋅ 1/2H2O

2012 ◽  
Vol 02 (04) ◽  
pp. 1230014 ◽  
Author(s):  
R. ELWEJ ◽  
A. OUESLATI ◽  
F. HLEL
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Grain Boundary ◽  
Complex Impedance ◽  
Impedance Spectrum ◽  
Electrical Equivalent Circuit ◽  
Compound C ◽  
Wide Range ◽  
Electrical And Dielectric Properties ◽  
Nyquist Plots

The electrical and dielectric properties of the compound C7H12N2[H2PO4]2 ⋅ 1/2H2O were investigated by the complex impedance spectroscopy, over a wide range of frequencies and temperatures, 600 Hz–5 MHz and 303–408 K, respectively. Besides, a detailed analysis of the impedance spectrum suggested that the electrical properties of the material at several temperatures and the electrical equivalent circuit have been proposed to explain the impedance results. Concerning the Nyquist plots, they clearly showed the presence of bulk and grain boundary. As for the imaginary part of modulus at several temperatures, it shows double relaxation peaks, thus suggesting the presence of grains and grain boundary conductions in the sample.

scholarly journals Investigation of Electrical Properties of the Al/SiO2/n++-Si Resistive Switching Structures by Means of Static, Admittance, and Impedance Spectroscopy Measurements

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6042
Author(s):  
Piotr Wiśniewski ◽  
Jakub Jasiński ◽  
Andrzej Mazurak ◽  
Bartłomiej Stonio ◽  
Bogdan Majkusiak
Keyword(s):  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Equivalent Circuit ◽  
Resistive Switching ◽  
Measurement Techniques ◽  
Complex Impedance ◽  
Electrical Characterization ◽  
Electrical Equivalent Circuit ◽  
Switching Phenomenon ◽  
Measurement Results

In this study, the resistive switching phenomenon in Al/SiO2/n++-Si structures is observed and studied by means of DC, small-signal admittance, and complex impedance spectroscopy measurements. Possible transport mechanisms in the high and low resistance states are identified. Based on the results of the applied measurement techniques, an electrical equivalent circuit of the structure is proposed. We discuss the effect of parasitic elements influencing the measurement results and show that a proper model can give useful information about the electrical properties of the device. A good agreement between the characteristics of the proposed equivalent circuit and the experimental data, based on different measurement procedures, confirms the validity of the used methodology and its applicability to the electrical characterization of RRAMs.

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

Impedance Analysis of Layer Structured NBT–CBT Mixed Ceramics

1998 ◽  
Vol 12 (11) ◽  
pp. 433-441 ◽  
Author(s):  
P. S. Rama Sastry ◽  
T. Bhimasankaram ◽  
G. S. Kumar ◽  
G. Prasad
Keyword(s):  
Comparative Study ◽  
Complex Impedance ◽  
Impedance Analysis ◽  
Equivalent Circuits ◽  
Impedance Spectra ◽  
Ceramic System ◽  
Different Temperatures ◽  
Mixed Ceramics ◽  
Mixed Ceramic ◽  
Complex Impedance Spectra

Complex impedance spectra of ferroelectric mixed ceramic system ( Na 0.5 Bi 0.5)1-x Ca x Bi 4 Ti 4 O 15 with x=0, 0.1, 0.3, 0.5, 0.7 and 1 was studied as a function of frequency and temperature in the range 1 KHz to 10 MHz and 30°C to 620°C respectively. Equivalent circuits involving resistive and capacitive elements at different temperatures, activation energies of relaxations and conduction were evaluated using impedance plots. A comparative study of impedance and conductivity facilities an insight in understanding the electrical nature of these electroceramics.

Electrical Conductivity and Structural Studies on the Binary System BiI3-Ag2SO4

2012 ◽  
Vol 584 ◽  
pp. 521-525
Author(s):  
S. Austin Suthanthiraraj ◽  
Ayesha Saleem
Keyword(s):  
Electrical Conductivity ◽  
Binary System ◽  
Ionic Conduction ◽  
Structural Characteristics ◽  
Complex Impedance ◽  
Present System ◽  
Rapid Melt Quenching ◽  
Ionic Nature ◽  
Electrochemical Devices ◽  
Silver Sulphate

A new solid-state pseudo binary system BiI3_-Ag2SO4 involving bismuth triiodide (BiI3) and a silver oxysalt namely silver sulphate (Ag2SO4) has been prepared using rapid melt-quenching technique. AC conductivity studies have been carried out on the nine different samples of the (BiI3)x –- (Ag2SO4)(1-x) system with compositions corresponding to x=0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8 and 0.9 mole fraction at temperatures ranging from room temperature (298 K) to 433K. The bulk resistance values estimated using complex impedance plots indicated that electrical conductivity of the synthesized solid specimens would vary from 2.9 x10-2 to 3.4 x10-6Scm-1 thus suggesting the present system to be ionic in nature. The extent of ionic conduction due to Ag + cation has also been analyzed using Wagner’s dc polarization technique whereas detailed structural characteristics of the various compositions derived from Fourier transform infrared (FTIR) spectroscopy and features of surface morphology of these samples obtained using scanning electron microscopy (SEM) have further supported the ionic nature of the chosen system and suggested possible application as a solid electrolyte in electrochemical devices.

Complex Impedance Spectroscopy of Bi-Substituted Yttrium Iron Garnet (YIG)

2007 ◽  
Vol 336-338 ◽  
pp. 709-711 ◽  
Author(s):  
Hong Jie Zhao ◽  
Ji Zhou ◽  
Zhi Lun Gui ◽  
Long Tu Li
Keyword(s):  
Grain Boundaries ◽  
Yttrium Iron Garnet ◽  
Complex Impedance ◽  
Physical Structure ◽  
Impedance Spectra ◽  
Yttrium Iron ◽  
Electrical Equivalent Circuit ◽  
Small Resistance ◽  
Iron Garnet ◽  
Complex Impedance Spectra

The effects of Bi-substitution on the complex impedance spectra of yttrium iron garnet (YIG) were studied in this paper. The polycrystalline yttrium iron garnet Y2BiFe5O12 (YIG: Bi) and Y3Fe5O12 (YIG) samples were prepared by solid-reaction method. The complex impedance spectra were measured in the frequency range from 1 KHz to 100MHz at several temperatures between 210oC and 500oC. The complex impedance sample shows that the YIG: Bi can be represented by double Cole-Cole semicircles, and the YIG can be represented by a single Cole semicircle. The physical structure of the specimen was visualized as comprising of small resistance grains separated by large resistance grain boundaries in accordance with the impedance spectra observations. The electrical processes in the sample were modeled in the form of an electrical equivalent circuit made up of a series combination of two parallel RC circuits attributed to grains and grain boundaries. The temperature dependence of bulk resistance indicated an evidence of Arrhenius-type thermally activated process, showing a close to linear variation up to a temperature of 740 K.

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