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Journal articles on the topic 'AC-DC Conductivity'

Author: Grafiati

Published: 7 June 2025

Last updated: 17 July 2025

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Tsangaris, G. M., G. C. Psarras, and E. Manolakaki. "DC and AC Conductivity in Polymeric Particulate Composites of Epoxy Resin and Metal Particles." Advanced Composites Letters 8, no. 1 (1999): 096369359900800. http://dx.doi.org/10.1177/096369359900800104.

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The DC and AC conductivity of composites with epoxy resin and nickel particles was investigated for various content of nickel powder from ambient to 120 °C. AC conductivity was measured in the frequency range 10 Hz to 13 MHz. An enhancement of conductivity was evidenced increasing conductive filler content and temperature. AC conductivity was found to be frequency dependent beyond a critical frequency ω c. The activation energy of the temperature shift of ω c was compared to the activation energy of DC conductivity.

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Szpakiewicz-Szatan, Aleksander, Szymon Starzonek, Jerzy E. Garbarczyk, Tomasz K. Pietrzak, Michał Boćkowski, and Sylwester J. Rzoska. "AC Electric Conductivity of High Pressure and High Temperature Formed NaFePO4 Glassy Nanocomposite." Nanomaterials 14, no. 18 (2024): 1492. http://dx.doi.org/10.3390/nano14181492.

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Olivine-like NaFePO4 glasses and nanocomposites are promising materials for cathodes in sodium batteries. Our previous studies focused on the preparation of NaFePO4 glass, transforming it into a nanocomposite using high-pressure–high-temperature treatment, and comparing both materials’ structural, thermal, and DC electric conductivity. This work focuses on specific features of AC electric conductivity, containing messages on the dynamics of translational processes. Conductivity spectra measured at various temperatures are scaled by apparent DC conductivity and plotted against frequency scaled by DC conductivity and temperature in a so-called master curve representation. Both glass and nanocomposite conductivity spectra are used to test the (effective) exponent using Jonscher’s scaling law. In both materials, the values of exponent range from 0.3 to 0.9, with different relation to temperature. It corresponds to the electronic conduction mechanism change from low-temperature Mott’s variable range hopping (between Fe2+/Fe3+ centers) to phonon-assisted hopping, which was suggested by previous DC measurements. Following the pressure treatment, AC conductivity activation energies were reduced from EAC≈0.40 eV for glass to EAC≈0.18 eV for nanocomposite and are lower than their DC counterpart, following a typical empirical relation with the value of the exponent. While pressure treatment leads to a 2–3-orders-of-magnitude rise in the AC and apparent DC conductivity due to the reduced distance between the hopping centers, a nonmonotonic relation of AC power exponent and temperature is observed. It occurs due to the disturbance of polaron interactions with Na+ mobile ions.

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Ahmed, Fatma B. M., Ali Badawi, and Fouad Abdel-Wahab. "The effect of non-bridging oxygen on the electrical transport of some lead borate glasses containing cobalt." Zeitschrift für Naturforschung A 76, no. 9 (2021): 847–52. http://dx.doi.org/10.1515/zna-2021-0096.

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Abstract The effect of reducing oxygen in glass network on the electrical conductivity of system 50 B2O3 − 20 Pb3O4 − 10 Co3O4 − (20 − x)CaO − xCaCl2 (0 ≤ x ≤ 20 mol%) has thoroughly been investigated. This reduction was created by substituting oxygen ions with chloride ions. The measurements were conducted in the temperature range 320–560 K for fixed frequencies 0.1, 1, 10 and 100 kHz. It was found that at low temperatures, the dc conductivity (σ dc) is lower than the measured ac conductivity σ(ω), whereas σ(ω) and σ dc became equal at high temperature for all frequencies. The ac, dc conductivity as well as dc activation energies decrease with the gradual increase of CaCl2 content. The ac conductivity and the frequency exponent data showed that the correlated barrier hopping of electrons between both of oxidation states of cobalt ions (Co2+ and Co3+) is the most probable mechanism. The dielectric constant and the dielectric loss of the present glass system can be fitted to the Cole–Cole equation for all frequencies and temperatures.

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McLachlan, David S., and Godfrey Sauti. "The AC and DC Conductivity of Nanocomposites." Journal of Nanomaterials 2007 (2007): 1–9. http://dx.doi.org/10.1155/2007/30389.

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The microstructures of binary (conductor-insulator) composites, containing nanoparticles, will usually have one of two basic structures. The first is the matrix structure where the nanoparticles (granules) are embedded in and always coated by the matrix material and there are no particle-particle contacts. The AC and DC conductivity of this microstructure is usually described by the Maxwell-Wagner/Hashin-Shtrikman or Bricklayer model. The second is a percolation structure, which can be thought to be made up by randomly packing the two types of granules (not necessarily the same size) together. In percolation systems, there exits a critical volume fraction below which the electrical properties are dominated by the insulating component and above which the conducting component dominates. Such percolation systems are best analyzed using the two-exponent phenomenological percolation equation (TEPPE). This paper discusses all of the above and addresses the problem of how to distinguish among the microstructures using electrical measurements.

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McLachlan, D. S., Kefeng Cai, and G. Sauti. "AC and dc conductivity-based microstructural characterization." International Journal of Refractory Metals and Hard Materials 19, no. 4-6 (2001): 437–45. http://dx.doi.org/10.1016/s0263-4368(01)00024-5.

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Lunkenheimer, P., G. Knebel, A. Pimenov, G. A. Emel’chenko та A. Loidl. "Dc and Ac conductivity of La2CuO4+δ". Zeitschrift für Physik B Condensed Matter 99, № 4 (1995): 507–16. http://dx.doi.org/10.1007/s002570050069.

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Lunkenheimer, P., G. Knebel, A. Pimenov, G. A. Emel’chenko та A. Loidl. "Dc and Ac conductivity of La2CuO4+δ". Zeitschrift für Physik B Condensed Matter 99, № 1 (1995): 507–16. http://dx.doi.org/10.1007/bf02769974.

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Zukowski, Pawel, Konrad Kierczynski, Przemyslaw Rogalski, et al. "Analysis of the Influence of Insulation Moisture during Long-Term Exploitation of Transformers on Their Reliability as Determined by Alternating Current Electrical Parameters." Energies 17, no. 8 (2024): 1952. http://dx.doi.org/10.3390/en17081952.

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This paper presents the results of the study of the direct current (DC) and alternating current (AC) electrical properties of an electrical pressboard–bio-insulating oil–water composite in a wide range of water content and temperatures used in electric power transformers. These parameters allow the level of insulation reliability to be determined after many years of operation of power transformers. To analyse the experimental results, a model of the DC and AC conductivities of nanocomposites based on the quantum-mechanical phenomenon of electron tunnelling was used. It was found that in a low-frequency region, the conductivities of AC and DC and their activation energy are equal. The relaxation times of AC conductivity and permittivity are also equal. It was found that the dependence of the DC conductivity on the distance between water molecules is an exponential function. On the basis of the model of conductivity by electron tunnelling between potential wells, the average number of water molecules in a nanodroplet, located in a composite of electrical pressboard–bio-insulating oil–moisture was determined to be (126 ± 20). It was found that the measured dependencies of DC and AC conductivity, permeability and dielectric relaxation times are consistent with the results of computer simulations performed on the basis of the model. This study showed that the composite of pressboard impregnated with bio-oil spontaneously transforms through water absorption into a pressboard–bio-oil–water nanocomposite. These will serve as the basis for the application of actual conductivity and dielectric relaxation mechanisms to improve the accuracy of moisture estimation in the solid component of power transformer insulation carried out on the basis of measurements of DC and AC properties. This will improve the operational safety of the transformers, minimise the occurrence of transformer failure and the associated environmental pollution.

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Hussain, Md Ashfaq, S. Sindhu, B. Raghunanda, and S. Molakeri Ajai Kumar. "Synthesis, Characterization and Electrical Properties of ZnFe2O4 Nanoparticles." Journal of Nanoscience and Technology 7, no. 2 (2021): 946–48. http://dx.doi.org/10.30799/jnst.323.21070201.

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Zinc ferrite (ZnFe2O4) nanoparticles were prepared by combustion method. The FT-IR, XRD and SEM with EDS were used to characterize the prepared sample. The characterization results confirm the successful synthesis of ZnFe2O4 nanoparticles with the particle size range of 24 – 30 nm. The temperature dependent DC conductivity of the sample has been studied in the temperature range 30-175 °C and AC conductivity was investigated between the frequencies of 10 Hz and 10 MHz. DC conductivity of the sample was increased while increasing temperature and AC conductivity was increased as the frequency increased.

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Bhuvaneswari, G., and S. Rameshkumar. "ELECTROCHEMICAL EVALUATION OF HUMIDITY BASED PROTON CONDUCTIVITY OF ALUMINIUM(III) TARTRATE." International Journal of Membrane Science and Technology 10, no. 2 (2023): 3041–55. http://dx.doi.org/10.15379/ijmst.v10i2.3042.

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Aluminium(III) tartrate was synthesized by simple solution crystallization and its humidity dependent proton conductivity was evaluated using electrochemical impedance spectroscopy. The compound exhibited very low DC conductivity and AC conductivity in the as synthesized form and dried conditions. However, upon exposing to 100% relative humidity(RH) the AC conductivity of the compound increased significantly with time and is several orders greater than DC conductivity. The structural stability of the compound was analysed by FTIR and PXRD experiments. The compound has good structural stability on hydration, dehydration and rehydration. The proton conductivity of the sample decreased several orders on dehydration and it bounces back to original value on rehydration. The complex exhibited reversible proton conductivity with respect to moisture. The variation of proton conductivity with temperature implies that the compound exhibits Grotthuss type proton conductivity.

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Kukhar', E. I., S. V. Kryuchkov, and E. S. Ionkina. "Dynamic conductivity of ac–dc-driven graphene superlattice." Physica E: Low-dimensional Systems and Nanostructures 80 (June 2016): 14–18. http://dx.doi.org/10.1016/j.physe.2016.01.004.

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Al-Haddad, Raad M., Iftikhar M. Ali, Issam M. Ibrahim, and Izzat M. Al-Essa. "DC AND AC CONDUCTIVITY MEASUREMENTS OF Se60Te30Ge10 FILMS." Journal of Al-Nahrain University Science 12, no. 4 (2009): 72–77. http://dx.doi.org/10.22401/jnus.12.4.08.

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PRASAD, N. V., J. SUBRAHMANYAM, P. NARAYANA MURTY, S. KARMAKAR, and S. M. GUPTA. "IMPEDANCE MEASUREMENTS ON PZT ANDLa0.75Bi3.25Ti3O12CERAMICS." International Journal of Modern Physics B 23, no. 19 (2009): 3881–93. http://dx.doi.org/10.1142/s0217979209053011.

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Impedance measurements were made on technological important ferroelectric ceramics, namely PZT and La0.75Bi3.25Ti3O12(BLT), in the frequency range of 100 Hz to 1 MHz, from room temperature to 500°C. Combined impedance and modulus spectroscopic analysis along with the detailed conductivity (ac and dc) data was used to understand the heterogeneity of the ceramics and the results were corroborated with temperature coefficient of dc-conductivity (figure of merit) data for the further understanding. AC-conductivity plots against frequency at different temperatures for PZT and BLT suggest the response of obeying Jonscher's and modified Jonscher's law, respectively.

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Suhailath, K., and MT Ramesan. "Theoretical and experimental studies on DC conductivity and temperature-dependent AC conductivity of poly(butyl methacrylate)/Nd-TiO2 nanocomposites." Journal of Thermoplastic Composite Materials 33, no. 8 (2019): 1061–77. http://dx.doi.org/10.1177/0892705718817350.

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Electrically conductive nanocomposite system based on poly(butyl methacrylate) (PBMA) with different contents of neodymium-doped titanium dioxide (Nd-TiO2) was prepared by in situ free radical polymerization method. The effect of Nd-TiO2 on the morphology and structural properties of the composites was carried out by scanning electron microscope (SEM) and X-ray diffraction analysis (XRD). The temperature-dependent AC conductivity and DC electrical conductivity of PBMA/Nd-TiO2 nanocomposites were studied with respect to the different volume fraction of Nd-TiO2 nanoparticles. SEM and XRD patterns revealed the uniform dispersion and structural regularity of nanoparticles in the polymer matrix. The AC conductivity of PBMA and its composites were found to be increased with an increase in temperatures and frequencies. The activation energy and exponential factor were analyzed from AC conductivity and both results indicate the hopping conduction mechanism present in PBMA/Nd-TiO2 nanocomposite, which is responsible for the variation of conductivity with temperature also. The DC conductivity of nanocomposites was higher than pure PBMA and the conductivity increases with increase in the concentration of Nd-TiO2 nanoparticles. Experimental and theoretical investigations based on McCullough, Bueche, Scarisbrick, and Mamunya modeling were carried out to observe the DC conductivity differences induced by the addition of Nd-TiO2 nanoparticles in PBMA matrix. Among the various modeling studied here, Mamunya model shows better agreement with the experimental conductivity.

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Halizan, Muhammad Zharfan, and Zakiah Mohamed. "Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite." Materials 15, no. 12 (2022): 4363. http://dx.doi.org/10.3390/ma15124363.

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Relatively new double perovskite material, Sr2CaTeO6, has been prepared through conventional solid-state procedures. Structural, dielectric, and optical characteristics of this exquisite solid-state material were analysed in this study. The single-phase monoclinic P21/n structure of this prepared compound was well correlated with the literature review. Good distribution of grain sizes and shapes was observed in the morphological study of this compound. The discussions on its optical and dielectric properties are included in this manuscript. High dielectric real permittivity, low dielectric loss, and good capacitance over a range of temperatures possessed by this compound, as shown in dielectric and electrical modulus studies, indicated good potential values for capacitor applications. The Ro(RgQg)(RgbQgb) circuit fitted well with the impedance and electrical modulus plot of the compound. Its relatively high electrical DC conductivity in grain at high frequencies and its increasing value with the temperature are typical of a semiconductor behaviour. This behaviour might be attributed to the presence of minor oxygen vacancies within its lattice structure and provides a long-range conduction mechanism. A small difference between activation energy and Ea of DC conductivity indicates that the same charge carriers were involved in both grains and the grain boundaries’ long-range conduction. The electrical AC conductivity of this compound was found to contribute to the dielectric loss in grain structure and can be related to Jonscher’s power law. The presence of polarons in this compound was exhibited by non-overlapping small polaron tunnelling (NSPT) and overlapping large polaron tunnelling (OLPT) conduction mechanisms over a range of temperatures. Wide optical band gap and Eopt in the range of 2.6 eV to 3.6 eV were determined by using an indirect and direct allowed mechanism of electrons transitions. These values supported the efficient semiconducting behaviour of the grain in this material and are suitable for applications in the semiconductor industry.

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PRASAD, N. V., G. PRASAD, and G. S. KUMAR. "ELECTRICAL PROPERTIES OF RARE EARTH SUBSTITUTED Bi6Fe2Ti3O18 COMPOUND." International Journal of Modern Physics B 16, no. 16 (2002): 2231–46. http://dx.doi.org/10.1142/s0217979202010324.

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The Ac conductivity measurements of polycrystalline materials of rare earth substituted Bi 6 Fe 2 Ti 3O18 compound at different frequencies (1 kHz–1 MHz) and temperatures (30–550°C) are reported. The dc conductivity, ionic hoping rate as well as carrier densities have been extracted from the ac conductivity data. The results show that hoping mechanism dominates at lower temperature. The results are discussed.

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Thamir Salman Bachari. "Study the effect of kaolin on the electrical properties of polyvinyl acetate-polyol composite." Journal of Wasit for Science and Medicine 8, no. 3 (2022): 18–31. http://dx.doi.org/10.31185/jwsm.259.

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Polyvinyl acetate and polyol (PVA-Polyol) has been blended in percentage by weight 3:1 and a mixture has been done by mixing different percentages by weight of kaolin for electrical measurements. Diagnosis of kaolin was measured by FTIR spectrophotometer. Quality factor (Q), dissipation factor (D), parallel resistance (R), pseries resistance (R), impedance (Z), series capacitance (C) and parallel capacitance ss(C) and Phase angle (Φ) were measured. The maximum electrical conductivity is pfound 6794 S.m-1 for samples 1, 3wt% kaolin and the minimum electrical conductivity is 1x10-5 S.m-1 for sample (2) 5wt% kaolin. Dielectric constants (έ), dielectric loss (έ′), have been studied and calculated. The frequency dependent ac conductivity (σ) and frequency independent dc conductivity (σ) has studied and acdcinvestigated. The calculated minimum and maximum ac conductivity (σ) is 3.2x10-5 acS.m-1 for samples (3) 6wt % kaolin and 0.45 S.m-1 for sample (2) 5wt % kaolin. The minimum and maximum calculated independent frequency dc conductivity (σ) is -dc 0.3472 S.m-1 for sample (2) 5wt % kaolin and 1.1671 S.m-1 for sample (1) 3wt % kaolin.

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Akrap, A., D. Staresinic, K. Biljakovic, P. Lunkenheimer, and A. Loidl. "Thermal hysteresis in low frequency dielectric response of charge density wave systems TaS3 and K0.3Mo03." Journal de Physique IV 12, no. 9 (2002): 313–14. http://dx.doi.org/10.1051/jp4:20020423.

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Low frequency dielectric response of charge density wave systems K0.3MoO3 and o-TaS3 shows hysteresis on temperature cycling. The closing of the hysteresis at low temperature coincides in both systems with the closing of the hysteresis in DC conductivity and corresponds to the temperature of the glass transition observed in dielectric response of these two systems. AC conducitivity is higher on heating, while DC conductivity is lower, i.e. two loops have opposite directions. Higher AC conducitivity (or dielectric response) is a consequence of more corrugated CDW phase on heating.

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Rao Bitra, H. C., A. V. Rao, A. G. S. Kumar, and G. N. Rao. "Investigation of low temperature dielectric properties of manganese doped-copper oxide nanoparticles by coprecipitation method." Digest Journal of Nanomaterials and Biostructures 16, no. 3 (2021): 1173–83. http://dx.doi.org/10.15251/djnb.2021.163.1173.

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Mn-doped CuO nanoparticles were prepared by the co-precipitation method. X-ray diffraction patterns of pristine and Mn-doped CuO (5, 10 and 15%) nanoparticles confirm the formation of monoclinic structure. Scanning electron microscopy revealed that, the change in morphology with increasing Mn content. Dielectric permittivity value increases with increase in Mn concentration. AC conductivity curves depict improvement in conductivity with a low concentration of Mn content. DC conductivity and AC conductivity values are in accordance with Jonscher’s universal power law

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Prasad, N. V., G. Prasad, T. Bhimasankaram, S. V. Suryanarayana, and G. S. Kumar. "Synthesis and Electrical Properties of SmBi5Fe2Ti3O18." Modern Physics Letters B 12, no. 10 (1998): 371–81. http://dx.doi.org/10.1142/s0217984998000469.

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SmBi 5 Fe 2 Ti 3 O 18, a five layered bismuth oxide compound is synthesized using a solid-state double sintering method. DC conductivity, impedance, and AC conductivity are studied in the temperature range 30–500°C and frequency range 1 kHz–1 MHz. Complex impedance plots are used to separate grain and grain boundary contributions to electrical impedance. Activation energy for DC conductivity was found to be around 1.0 eV. The results are analyzed to understand the conductivity mechanism.

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Sahu, A. K., S. K. Satpathy, and Banarji Behera. "Dielectric and frequency-dependent transport properties of lanthanum-doped bismuth ferrite." Journal of Advanced Dielectrics 09, no. 04 (2019): 1950031. http://dx.doi.org/10.1142/s2010135x19500310.

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Polycrystalline samples of Bi[Formula: see text]LaxFeO3 [[Formula: see text], 0.6, 0.7 and 0.8] were synthesized through high temperature solid state reaction method. The structural studies of the compounds were done using X-ray diffraction technique. Dielectric constant and dielectric loss were studied for various frequencies (100[Formula: see text]Hz–104[Formula: see text]Hz) at different temperatures. The temperature-dependent non-Debye type relaxation process was suggested in the materials from the analysis of frequency-dependent electrical data at different temperatures. Temperature dependence of dc and ac conductivity at various frequencies showed negative temperature coefficient of resistance (NTCR) behavior. The frequency dependence of ac conductivity at different temperatures obeyed Jonscher’s universal power law. The temperature dependence of dc and ac conductivity was fitted to Arrhenius equation. The activation energies at different temperature ranges were calculated to know the charge species involved in the conduction process.

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Ameer, Shahid, and Asghari Maqsood. "Electrical and Dielectric Spectroscopic Characterization of Polycrystalline Dy₂Si₂O₇." Key Engineering Materials 510-511 (May 2012): 194–200. http://dx.doi.org/10.4028/www.scientific.net/kem.510-511.194.

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The compound Dy2Si2O7exists in two polymorphs, the low temperature triclinic phase (type B) and a high temperature orthorhombic phase (type E).The dc and ac electrical conductivities of E-Dy2Si2O7are measured in the temperature range 290-510 K and frequency range 1 kHz to 1 MHz . The dc electrical transport data are analyzed according to Motts variable-range hopping model. The disorder parameter (To) and density of states at fermi level are obtained. The ac conductivity σac(ω) is obtained through the dielectric parameters. The ac conductivity can be expressed as σac(ω) =B ωs, where s is slope and it decreases with increase in temperature. The conduction mechanism in the compound is discussed in low and high temperature regions in the light of theoretical models.

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Sirtawar, Kajal, Gajanan Lamdhade, Kishor Raulkar, Saeed Alqaed, Jawed Mustafa, and Shahid Husain. "Investigation of AC and DC Electrical Conductivity in Ethyl Cellulose (EC) and Poly Methyl Methacrylate (PMMA) Polyblends." Science of Advanced Materials 16, no. 5 (2024): 635–41. http://dx.doi.org/10.1166/sam.2024.4690.

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The study of AC and DC electrical conductivity is crucial for understanding the behavior of charge carriers within materials and their mobility. Ethyl cellulose (EC) stands out among cellulose ethers due to its favorable electrical, mechanical, and weathering properties. Poly Methyl Methacrylate (PMMA) is a thermoplastic known for its rigidity, transparency, and outdoor durability, making it a valuable material. Despite being insulating materials, both EC and PMMA exhibit limited free charge carriers and low mobility. In this research, AC and DC electrical properties of Ethyl Cellulose (EC), Poly Methyl Methacrylate (PMMA), and their blends doped with tetrahydrofuran (THF) film were investigated using isothermal evaporation techniques. The investigation focused on the effects of temperature, electric field, and frequency on electrical conduction mechanisms. Measurements were conducted across frequencies ranging from 1 KHz to 1 MHz at temperatures between 323 K and 373 K. Results indicate that AC electrical conductivity of Ethyl Cellulose (EC), Poly Methyl Methacrylate (PMMA), and their blend (EC/PMMA) increases with higher frequencies of the applied electric field. Meanwhile, DC electrical conductivity of Ethyl Cellulose (EC), Poly Methyl Methacrylate (PMMA), and their blend (EC/PMMA) rises with increasing temperature. X-ray diffraction (XRD) analysis further supports these conductivity changes in the blend.

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Vijaykumar, B. T., B. Manjunatha, and Basavaraja Sannakki. "Studies on Structural, Morphological, Electrical, and Gas Sensing Properties of the Polyaniline/Manganese Dioxide (PANI/MnO2) Composites." Indian Journal Of Science And Technology 17, no. 32 (2024): 3361–67. http://dx.doi.org/10.17485/ijst/v17i32.334.

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Objectives: To synthesize the pure PANI and PANI/MnO2 composites from the reaction of aniline monomer polymerization with manganese oxide (MnO2) particles. Methods: The structural, morphological, and electrical conductivity investigation of pure PANI and composites was done with powder XRD, SEM, and Impedance spectra; Ammonium persulfate was used as an oxidant. The temperature-dependent DC conductivity of samples is studied in the temperature range of 30°C to 200°C. The AC electrical conductivity of the prepared composites from impedance spectroscopy was carried out and compared with pure materials. The AC conductivity of prepared composites has been analyzed as a function of frequency. Findings: It has been successfully prepared by in situ polymerization. XRD results of the PANI/MnO2 composites reveal that the crystalline structure is converted into a very less crystalline structure due to the incorporation of MnO2 which is inside the PANI chain. The structural, morphological and conductivity of the composites remain relative to changes with respect to the weight percentage of MnO2. The AC conductivity of composites varies depending upon a change of logarithmic frequency. On exposure to LPG gas, variation in resistance and response of the composites was observed. Novelty: All the samples were prepared and investigated the method of in-situ chemically polymerization mechanism. Keywords: Manganese oxide, Polyaniline, XRD, SEM, AC, DC, Electrical properties, LPG

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Thanh, Tran Dang, and Le Van Hong. "AC and DC Conductivity of Multiferroic La2-xSrxNiO4+¥ä." Journal of the Korean Physical Society 52, no. 5 (2008): 1456–59. http://dx.doi.org/10.3938/jkps.52.1456.

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Ganaie, Mohsin, Shabir Ahmad, Shama Islam, and M. Zulfequar. "Dc, Ac Conductivity and Dielectric Analysis of SeTe Alloy." Advanced Science Letters 20, no. 7 (2014): 1360–63. http://dx.doi.org/10.1166/asl.2014.5550.

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Barrau, Sophie, Philippe Demont, Alain Peigney, Christophe Laurent, and Colette Lacabanne. "DC and AC Conductivity of Carbon Nanotubes−Polyepoxy Composites." Macromolecules 36, no. 14 (2003): 5187–94. http://dx.doi.org/10.1021/ma021263b.

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Fehr, K. T., M. Holzapfel, A. Laumann, and E. Schmidbauer. "DC and AC conductivity of Li4/3Ti5/3O4 spinel." Solid State Ionics 181, no. 23-24 (2010): 1111–18. http://dx.doi.org/10.1016/j.ssi.2010.05.026.

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Trivedi, T. R., A. T. Oza, V. A. Patel, and S. K. Arora. "DC and AC Conductivity of Barium Hydrogen Phosphate (BaHPO4)." Crystal Research and Technology 35, no. 5 (2000): 615–24. http://dx.doi.org/10.1002/1521-4079(200005)35:5<615::aid-crat615>3.0.co;2-5.

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Tarsikka, P. S., and B. Singh. "DC and ac conductivity of sodium—molybdenum phosphate glasses." Journal of Non-Crystalline Solids 124, no. 2-3 (1990): 221–28. http://dx.doi.org/10.1016/0022-3093(90)90266-o.

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Sathish, M., Ravikumara Nayaka, C. M. Dinesh, Gavisiddayya Mathad, Deepa Pathar, and Y. Shivaprakash. "Transport Properties of Niobium Doped Silver-Borate Glasses." Indian Journal Of Science And Technology 18, no. 5 (2025): 366–71. https://doi.org/10.17485/ijst/v18i5.sathish.

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Objective: To create a broad composition range of Nb2O5 doped silver-borate glasses without adding any reducing chemical agents and to achieve ac-dc conduction mechanism. Methods: Borate glasses compositions, (1-x)Nb2O5- 65B2O-(35-x)Ag2O, (Where x=0.1 to 0.5 mol%) have been synthesized by conventional melt-quenching technique. Temperature dependent conductivity over a wide range of frequency (40-10MHz) has been performed. Findings: Only one semicircle is visible in the impedance plots, suggesting the existence of a single kind of conduction mechanism. Fitting the data to the Almond West type power law behavior, 𝜎(𝜔) = 𝜎0 + 𝐴𝜔𝑠 is used for the analysis of the ac conductivity. It is also discovered that the power law exponent ”s” rises as the temperature rises. Indicating the temperature dependence of the conductivity of the samples. Novelty: The preparation of niobium doped silver-borate glass samples is achieved without the reducing agents and established the wide range of conduction mechanism by both Nb+ and Ag+ ions for the first time. Keywords: Glass; Transport Properties; AC-DC Conductivity; Ag-Ions; Almond-West Power Law

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QIU, Z. Y., L. HU, M. W. LIU, et al. "TEMPERATURE EFFECTS OF DIELECTRIC PROPERTIES OF ER FLUIDS." International Journal of Modern Physics B 10, no. 23n24 (1996): 3275–82. http://dx.doi.org/10.1142/s0217979296001720.

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Under the consideration of the role that energy transfer and dissipation play in ER effect, an improved theory frame for ER effects, polarization-dissipation-structure-rheology, is suggested. The theory frame is substantiated by the basic physical laws and certain critical experimental facts. The dielectric response of a diatomite ER fluid to temperature is measured in the temperature range of 140 K to 400 K. By comparison of the DC conductivity with the AC effective conductivity of the sample, we found that the AC dielectric loss consists of two parts. One part comes from the DC conductivity, the other from the response of the bound charges in scope of particle to AC field. It is suggested that the response of bound charges is very important to ER effects. Besides, the effect of temperature on shear stress is measured, and interpreted based on the dielectric measurements. The source of two loss peaks in the curve of the dielectric loss versus temperature is not clear.

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DEVI, CH SAMEERA, M. B. SURESH, G. S. KUMAR, and G. PRASAD. "SYNTHESIS, CHARACTERIZATION AND ELECTRICAL PROPERTIES OF Nd/Zr CO-DOPED NANO BaTiO3 CERAMICS." Journal of Advanced Dielectrics 02, no. 01 (2012): 1250001. http://dx.doi.org/10.1142/s2010135x12500014.

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Ceramic samples of composition Ba 1-3x Nd 2x Ti 1-y Zr y O 3 (x = 0.025;y = 0,0.025 and 0.05) were synthesized by modified sol–gel technique. Phase confirmation, surface morphology and electrical properties of the samples were studied using XRD, FESEM, impedance spectroscopy and DC conductivity. Impedance, AC and DC conductivities of the samples were recorded in the temperature range room temperature (RT) –500°C. From impedance data, various parameters like bulk resistance (R b ), bulk capacitance (C b ), grain resistance (R g ), grain boundary resistance (R gb ), grain capacitance (C g ) and grain boundary capacitance (C gb ) were determined. These parameters were found to be function of both temperature and frequency. Grain and grain boundary relaxation times (τg,τgb) were also evaluated as a function of temperature. From AC and DC conductivity plots activation energies for conduction were obtained. Results obtained lead to improved understanding of conductivity and charge transportation kinetics in the present system of samples.

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B, T. Vijaykumar, Manjunatha B, and Sannakki Basavaraja. "Studies on Structural, Morphological, Electrical, and Gas Sensing Properties of the Polyaniline/Manganese Dioxide (PANI/MnO2) Composites." Indian Journal of Science and Technology 17, no. 32 (2024): 3361–67. https://doi.org/10.17485/IJST/v17i32.334.

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Abstract Objectives: To synthesize the pure PANI and PANI/MnO2 composites from the reaction of aniline monomer polymerization with manganese oxide (MnO2) particles. Methods: The structural, morphological, and electrical conductivity investigation of pure PANI and composites was done with powder XRD, SEM, and Impedance spectra; Ammonium persulfate was used as an oxidant. The temperature-dependent DC conductivity of samples is studied in the temperature range of 30°C to 200°C. The AC electrical conductivity of the prepared composites from impedance spectroscopy was carried out and compared with pure materials. The AC conductivity of prepared composites has been analyzed as a function of frequency. Findings: It has been successfully prepared by in situ polymerization. XRD results of the PANI/MnO2 composites reveal that the crystalline structure is converted into a very less crystalline structure due to the incorporation of MnO2 which is inside the PANI chain. The structural, morphological and conductivity of the composites remain relative to changes with respect to the weight percentage of MnO2. The AC conductivity of composites varies depending upon a change of logarithmic frequency. On exposure to LPG gas, variation in resistance and response of the composites was observed. Novelty: All the samples were prepared and investigated the method of in-situ chemically polymerization mechanism. Keywords: Manganese oxide, Polyaniline, XRD, SEM, AC, DC, Electrical properties, LPG

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Falak, Ziyad. "Electrical and Dielectric properties of 3, 3', 3'', 3'''-tetra poly (1, 4-diaminobenzen phthalate) phthalocyanine copper (II) thin films prepared by casting method." University of Thi-Qar Journal of Science 3, no. 4 (2013): 164–71. http://dx.doi.org/10.32792/utq/utjsci/v3i4.535.

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In this study, 3, 3', 3'', 3'''-tetra poly (1, 4-diaminobenzen phthalate) phthalocyanine copper (II) film was prepared by casting method. The study consists of two parts: the first includes the measurement of electrical conductivity and activation energy range (303-353) °K. The second part deals with the dielectric properties that were measured at temperatures ranging from 303 to 353°K and frequency in the range (120Hz - 2MHz).Dielectric properties (dielectric permittivity, loss tangent and Ac. conductivity (σac) have also been investigated. It is found that the system obeys the Maxwell-Wagner Sillars relaxation of space charge phenomenon. Permittivity, loss tangent and Ac. conductivity increase with increasing the temperature and the permittivity decreases with the increasing of frequency. The values of ac conductivity and dc conductivity were compared.

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Fal, Jacek, Michał Wanic, Grzegorz Budzik, Mariusz Oleksy, and Gaweł Żyła. "Electrical Conductivity and Dielectric Properties of Ethylene Glycol-Based Nanofluids Containing Silicon Oxide–Lignin Hybrid Particles." Nanomaterials 9, no. 7 (2019): 1008. http://dx.doi.org/10.3390/nano9071008.

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This paper presents results of experimental investigation into dielectric properties of silicon oxide lignin (SiO2-L) particles dispersed with various mass fractions in ethylene glycol (EG). Measurements were conducted at a controlled temperature, which was changed from 298.15 to 333.15 K with an accuracy of 0.5 and 0.2 K for dielectric properties and direct current (DC) electrical conductivity, respectively. Dielectric properties were measured with a broadband dielectric spectroscopy device in a frequency range from 0.1 to 1 MHz, while DC conductivity was investigated using a conductivity meter MultiLine 3410 working with LR925/01 conductivity probe. Obtained results indicate that addition of even a small amount of SiO2-L nanoparticles to ethylene glycol cause a significant increase in permittivity and alternating current (AC) conductivity as well as DC conductivity, while relaxation time decrease. Additionally, both measurement methods of electrical conductivity are in good agreement.

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Supriya, Sweety, Sunil Kumar, and Manoranjan Kar. "Dielectric and ac Conductivity Studies on Nanocrystalline Mn Modified Cobalt Ferrite." Advanced Science Letters 24, no. 8 (2018): 5629–32. http://dx.doi.org/10.1166/asl.2018.12164.

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The ac conductivity and dielectric properties on CoFe2−xMnxO4 for x = 0.00, 0.10, 0.15 and 0.20 have been studied in detail. All the samples were prepared in nanocrystalline size. These materials are found to be crystallized to Fd <mml:math display="block"> <mml:semantics> <mml:mover accent="true"> <mml:mi>3</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:semantics> </mml:math> m space group in cubic spinel structure. The dielectric constant and ac conductivity has been discussed as a function of frequency, temperature and composition. The relation between dielectric constant and ac conductivity has been analyzed and the results validate each other. The frequency response of ac conductivity (σac) obeys Johnschers power law and the parameters obtained, explain the sources of ac and dc electrical conductivity in the material. The frequency response of σac follows Maxwell–Wagner two-layer model. The influence of frequency as pumping force on activation energy has been determined. The temperature dependent ac conductivity shows the Arrhenius behavior. The σac observed to be enhanced with increase in frequency as well as temperature. The semiconducting behavior (NTCR) was also evident from temperature dependent electrical transport properties study. The low value of ac conductivity suggests a possible use of this material in dielectric applications.

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Sundar, S. Ajin, and N. Joseph John. "Synthesis, Structural, Optical and Dielectric Studies on Carbon Dot-Zinc Oxide Nanocomplexes." International Journal of Nanoscience 17, no. 05 (2018): 1750021. http://dx.doi.org/10.1142/s0219581x17500211.

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In the present manuscript, we have reported the synthesis, structural, optical, AC conductivity and dielectric studies of carbon dot-zinc oxide (CDZO) nanocomplexes. CDZO nanocomplexes were synthesized by the wet chemical method. The refinement of X-ray powder diffraction data reveals that the sample possesses hexagonal structure of ZnO. The low intensity diffraction peaks corresponding to carbon come to existence, it is suggested that phase segregation has occurred in the CDZO nanoparticles. The strong absorption band observed in the UV region for the prepared samples can be attributed to the band edge absorption. Dielectric property and AC conductivity have been studied as a function of frequency (100[Formula: see text]Hz and 1[Formula: see text]kHz) of the applied AC signal in the temperature range 30[Formula: see text]C to 150[Formula: see text]C. The result showed that AC conductivity increases with increase of temperature. Dielectric loss and DC conductivity increase with increase of temperature.

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Мустафаева, С. Н., М. М. Асадов, С. С. Гусейнова, А. И. Джабаров та В. Ф. Лукичев. "Электронные, диэлектрические свойства и перенос заряда в монокристалле TlGaS-=SUB=-2-=/SUB=- : Nd-=SUP=-3+-=/SUP=- на постоянном и переменном токе". Физика твердого тела 64, № 4 (2022): 428. http://dx.doi.org/10.21883/ftt.2022.04.52182.251.

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The band structure, density of states, and electronic properties of a 32-atomic supercell of a semiconductor compound TlGaS2 containing neodymium are calculated. On the grown new single crystals of TlGaS2: Nd3 + (0.3 mol% Nd2S3), experimental results on the physical properties have been obtained. The temperature (93–538 K) and frequency (5104–3.5107 Hz) dependences of the dc and ac conductivity and the frequency dispersion of the dielectric coefficients of TlGaS2: Nd3+ single crystals have been studied. It was found that in TlGaS2: Nd3 +, in the entire studied frequency range, there are losses due to electrical conductivity, and the charge transfer has a hopping character. The parameters of localized states are estimated, such as the density of localized states near the Fermi level and their spread, the average hopping time and distance, and the concentration of deep traps responsible for the dc and ac conductivity in TlGaS2: Nd3+.

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Ng, Wee Yang, Antonio Ramos, Yee Cheong Lam, I. Putu Mahendra Wijaya, and Isabel Rodriguez. "DC-biased AC-electrokinetics: a conductivity gradient driven fluid flow." Lab on a Chip 11, no. 24 (2011): 4241. http://dx.doi.org/10.1039/c1lc20495e.

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Donnelly, K. P., and B. R. Varlow. "Non-linear DC and AC conductivity in electrically insulating composites." IEEE Transactions on Dielectrics and Electrical Insulation 10, no. 4 (2003): 610–14. http://dx.doi.org/10.1109/tdei.2003.1219645.

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Staveren, M. P. J., J. T. Moonen, H. B. Brom, L. J. Jongh, and G. Schmid. "Ac and dc electrical conductivity of polynuclear metal cluster compounds." Zeitschrift f�r Physik D Atoms, Molecules and Clusters 12, no. 1-4 (1989): 461–64. http://dx.doi.org/10.1007/bf01426997.

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Dutta, P., S. Biswas, M. Ghosh, S. K. De, and S. Chatterjee. "The dc and ac conductivity of polyaniline–polyvinyl alcohol blends." Synthetic Metals 122, no. 2 (2001): 455–61. http://dx.doi.org/10.1016/s0379-6779(00)00588-9.

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Dumludag, F., O. Gunduz, O. Kılıc, et al. "DC and AC conductivity properties of bovine dentine hydroxyapatite (BDHA)." IOP Conference Series: Materials Science and Engineering 293 (December 2017): 012003. http://dx.doi.org/10.1088/1757-899x/293/1/012003.

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LEE, BUM-HOON, DA-WEI PANG, and CHANYONG PARK. "A HOLOGRAPHIC MODEL OF STRANGE METALS." International Journal of Modern Physics A 26, no. 14 (2011): 2279–305. http://dx.doi.org/10.1142/s0217751x11053481.

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We give a review on our recent work arXiv:1006.0779 [hep-th] and arXiv:1006.1719 [hep-th], in which properties of holographic strange metals were investigated. The background is chosen to be anisotropic scaling solution in Einstein–Maxwell–Dilaton theory with a Liouville potential. The effects of bulk Maxwell field, an extra U(1) gauge field and probe D-branes on the DC conductivity, the DC Hall conductivity and the AC conductivity are extensively analyzed. We classify behaviors of the conductivities according to the parameter ranges in the bulk theory and characterize conditions when the holographic results can reproduce experimental data.

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M, Sathish, Nayaka Ravikumara, M. Dinesh C, Mathad Gavisiddayya, Pathar Deepa, and Shivaprakash Y. "Transport Properties of Niobium Doped Silver-Borate Glasses." Indian Journal of Science and Technology 18, no. 5 (2025): 366–71. https://doi.org/10.17485/IJST/v18i5.Sathish.

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Objective: To create a broad composition range of Nb2O5 doped silver-borate glasses without adding any reducing chemical agents and to achieve ac-dc conduction mechanism. Methods: Borate glasses compositions, (1-x)Nb2O5- 65B2O-(35-x)Ag2O, (Where x=0.1 to 0.5 mol%) have been synthesized by conventional melt-quenching technique. Temperature dependent conductivity over a wide range of frequency (40-10MHz) has been performed. Findings: Only one semicircle is visible in the impedance plots, suggesting the existence of a single kind of conduction mechanism. Fitting the data to the Almond West type power law behavior, 𝜎(𝜔) = 𝜎0 + 𝐴𝜔𝑠 is used for the analysis of the ac conductivity. It is also discovered that the power law exponent ”s” rises as the temperature rises. Indicating the temperature dependence of the conductivity of the samples. Novelty: The preparation of niobium doped silver-borate glass samples is achieved without the reducing agents and established the wide range of conduction mechanism by both Nb+ and Ag+ ions for the first time. Keywords: Glass; Transport Properties; AC-DC Conductivity; Ag-Ions; Almond-West Power Law

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Cheng, YuJia, Liyang Bai, Guang Yu, and Xiaohong Zhang. "Effect of Particles Size on Dielectric Properties of Nano-ZnO/LDPE Composites." Materials 12, no. 1 (2018): 5. http://dx.doi.org/10.3390/ma12010005.

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The melt blending was used to prepare 3 wt% ZnO/low density polyethylene (ZnO/LDPE) nanocomposites in this article. The effect of different inorganic ZnO particles doping on the dielectrical property and crystal habit of LDPE matrix was explored. The nanoparticles size was 9 nm, 30 nm, 100 nm, and 200 nm respectively. Scanning electron microscope (SEM) was used to characterize ZnO nanoparticles whereas differential scanning calorimetry (DSC) was used to make thermal characterization of the samples. Besides, the AC (alternating current), DC (direct current breakdown characteristics and electrical conductivity of the nanocomposites was studied in this article. The experimental results showed that nano-ZnO/LDPE composites had the advantages such as small crystal size, high crystallization rate and crystallinity owing to nano-ZnO particles doping, when doping nano-ZnO particles size was 30 nm, the ZnO/LDPE nanocomposite crystallinity crest value 39.77% appeared. At the mean time, the DC and AC breakdown field strength values of composites were 138.0 kV/mm and 340.4 kV/mm respectively. They were the maximal values which improved 8.24% and 13.85% than LDPE. The AC breakdown field strength of samples decreased with specimen thickness increase. The DC breakdown field strength of LDPE and ZnO/LDPE composites were greater than AC breakdown field strength. From the conductivity experimental result it could be seen that when the experimental temperature and electric field intensity rose, the current density and conductivity of ZnO/LDPE composites increased with the enlargement of ZnO particles size. But the values were less than which of LDPE.

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Boissy, C., C. W. Wu, Y. Fahmy, and H. Conrad. "Experimental Study of the Yield Stress of Electrorheological Suspensions under AC Field: Comparison with a Theoretical Model." International Journal of Modern Physics B 13, no. 14n16 (1999): 1775–82. http://dx.doi.org/10.1142/s0217979299001788.

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Recently a model describing the interaction between the particles of an electrorheological suspension and the resulting properties (yield stress, current density) has been proposed by Wu and Conrad. This model takes into account both the conductivity and the permittivity of each constituent of the suspension and predicts the behavior under DC and AC fields. The goal of the present work is to compare the predictions of this model with data available in the literature and with additional experiments using DC and AC fields at frequencies up to 2000 Hz. The ER fluids used in our experiments are suspensions of different ceramics particles ( Al 2 O 3, ZrO 2, TiO 2, CaTiO 3, BaTiO 3) in silicone oil. These particles cover a wide range of permittivity and conductivity, which allows us to study the ER effect with varying values of the conductivity and/or permittivity mismatch between the particles and the liquid. The model is in reasonable accord with experiment.

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Abdullah, Omed Ghareb, Dana Abdull Tahir, Gelas Mukaram Jamal, and Salah Raza Saeed. "Dielectric Properties of Polyester Reinforced with Carbon Black Particles." Applied Mechanics and Materials 110-116 (October 2011): 170–76. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.170.

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Dielectric constant and ac conductivity of Polyester doped with carbon black are investigated in the frequency range (0.5-103) KHz and within the temperature range (26-80) oC. Dielectric permittivity and loss tangent reduced with increasing frequency and increase with increasing temperature. The ac conductivity σac for all samples were found to be weak frequency dependent at low frequency, however vary with frequency as a power law ωs at higher frequency range. The variation of frequency exponential factor s between 0.63 and 0.77, indicates a dominant hopping process at low temperatures. From the temperature dependence of dc conductivity, the increase of activation energy was observed with carbon black concentrations.

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Luo, Nan, Yong Lin, Jian Guo, et al. "Spark Plasma Sintering of LiFePO4: AC Field Suppressing Lithium Migration." Materials 14, no. 11 (2021): 2826. http://dx.doi.org/10.3390/ma14112826.

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Our work proposes a comparison between Spark Plasma Sintering of LiFePO4 carried out using an Alternating Current (AC) and Direct Current (DC). It quantifies the Li-ion migration using DC, and it validates such hypothesis using impedance spectroscopy, X-ray photoelectron spectroscopy and inductively coupled plasma optical emission spectroscopy. The use of an AC field seems effective to inhibit undesired Li-ion migration and achieve high ionic conductivity as high as 4.5 × 10−3 S/cm, which exceeds by one order of magnitude samples processed under a DC field. These results anticipate the possibility of fabricating a high-performance all-solid-state Li-ion battery by preventing undesired Li loss during SPS processing.

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