Article
Chemistry, Physical
A. Benali, M. Bejar, E. Dhahri, M. P. F. Graca, M. A. Valente, E. K. Hlil, B. F. O. Costa
Summary: Two nanoparticle orthoferrite materials were successfully synthesized, and the insertion of Bismuth and Titanium ions in A and B-sites was found to affect structural, dielectric, and magnetic properties. Both compounds showed a giant dielectric constant and low dielectric loss tangent, with two relaxation processes observed at different temperature ranges. Introduction of Titanium ions in B-site enhanced magnetization and decreased the Curie Weis temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yan Zhang, Yiren Sun
Summary: This study presents a practical approach to quickly obtain high-quality Prony series parameters for asphalt concrete using complex modulus test data. The approach directly determines the discrete spectra and elastic constants by fitting the corresponding generalized Maxwell model representations to smoothed data from the storage modulus representations. The results show that different complex modulus models can generate comparable Prony series parameters, and the Black diagram is recommended for examining the quality of the test data.
Article
Engineering, Electrical & Electronic
Arup Kumar Das, Sovan Dalai, Biswendu Chatterjee
Summary: A novel technique is proposed for estimating ingressed moisture content inside metal oxide surge arresters (MOSA), using dielectric modulus analysis to uncover relaxation characteristics obscured by electrode polarization effects. By analyzing the frequency variation of the complex dielectric modulus characteristics at different moisture content levels, changes in dielectric relaxation behavior with moisture ingression can be investigated. Empirically obtained relationships between ingressed moisture content and parameters of the Havriliak-Negami relaxation model can estimate ingressed moisture content inside a MOSA with acceptable accuracy.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Polymer Science
Mingzhu Qiu, Peng Cao, Liang Cao, Zhifei Tan, Chuantao Hou, Long Wang, Jianru Wang
Summary: This study uses genetic algorithm (GA) and Levenberg-Marquardt (L-M) algorithm to optimize parameter acquisition for 2S2P1D and Havriliak-Negami (H-N) viscoelastic models. It investigates the effects of different combinations of optimization algorithms on parameter acquisition accuracy in these two constitutive equations. The study also proposes an improved semi-analytical method for fitting the H-N model.
Article
Food Science & Technology
Fakfan Luangapai, Methavee Peanparkdee, Satoshi Iwamoto
Summary: The study successfully incorporated a curcumin nanoemulsion (CurNE) into chitosan (CH)-based films to improve their mechanical properties and reduce water vapor permeability. Evaluation of thermal and electrical properties revealed structural alterations. The antioxidant activity of CH-NE was significantly higher than CH.
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
S. I. Hernandez, L. F. del Castillo, Roxana M. del Castillo, Abel Garcia-Bernabe, V. Compan
Summary: A fractal Fokker-Planck formalism is proposed to describe dielectric relaxation in glass forming liquids. This formalism uses fractional-time derivatives and memory functions to describe the dynamics of the dipolar-moment autocorrelation function. The goal is to numerically obtain the description of the complex autocorrelation function and the real and imaginary parts of the second-order memory function. The results demonstrate the memory effect associated with the alpha-dielectric relaxation mode.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Mathematics, Applied
Nuodi Liu, Yanping Chen, Jianwei Zhou, Yunqing Huang
Summary: In this paper, a mixed finite element method (MFEM) is developed for solving the time-dependent Maxwell's equations in a Havriliak-Negami (H-N) dispersive medium. The unconditional stability of the fully discrete backward Euler scheme is proven, and global superconvergence results are obtained using interpolation postprocessing techniques. Numerical experiments in two dimensions are provided to demonstrate the validity of the theoretical analysis, which has not been discussed in any other publications.
APPLIED MATHEMATICS LETTERS
(2023)
Article
Chemistry, Analytical
Anis Allagui, Ahmed S. Elwakil, Costas Psychalinos
Summary: The decoupling of magnitude and phase properties of fractional-order fractance (FOF) has been investigated, and a modified circuit element has been proposed for modeling spectral electrochemical data, particularly useful for handling complex systems where classical FOF fails.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Kaouther Kahouli, Aida Ben Jazia Kharrat, Kamel Khirouni, Slaheddine Chaabouni
Summary: In this research paper, the [C13H16N2](5)(BiCl6)(3)Cl compound was synthesized and analyzed using various techniques. The phase transition at T = (400 +/- 5)K was confirmed through different measurements. The electrical conductivity was found to follow Jonscher's universal power law and was explained by two theoretical models.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Multidisciplinary Sciences
Michela Romanini, Roberto Macovez, Maria Barrio, Josep Lluis Tamarit
Summary: Temperature- and pressure-dependent dielectric spectroscopy and calorimetry techniques were used to characterize benzophenone and its ortho-bromobenzophenone derivative in the liquid and glass states. The study revealed the existence of a Johari-Goldstein relaxation in both compounds and identified the mechanism of intramolecular relaxation.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
A. Nazarenko, A. Pavlenko, Y. Yurasov
Summary: This study investigates the electrophysical properties of the YCu0.15Mn0.85O3 solid solution and proposes a nonclassical modified Havriliak-Negami model to describe the observed dispersion of dielectric parameters. The results demonstrate that this model accurately represents the frequency behavior of the complex conductivity and dielectric constant of the material.
JOURNAL OF ADVANCED DIELECTRICS
(2022)
Article
Engineering, Electrical & Electronic
Stavroula Kapoulea, Costas Psychalinos, Ahmed S. Elwakil
Summary: Double-exponent fractional-order impedance functions are crucial for modeling various biochemical materials and biological tissues. By selecting different exponents, well-known relaxation models can be obtained as special cases, and an integer-order Pade-based approximation of the Havriliak-Negami function is shown to be possible. Two application examples demonstrate the capabilities of this approach.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2021)
Article
Physics, Applied
Y. Yurasov, M. Tolstunov, A. Nazarenko, A. A. Pavelko, A. Yudin, I. A. Verbenko, L. A. Reznitchenko
Summary: This work presents the results of studying the electrophysical properties of composite polymer ceramics. The concentration dependence of piezomodules and dispersion of dielectric parameters in the material were analyzed, along with the use of a modified Havriliak-Negami model to describe temperature-frequency properties. The study showed that the dielectric spectra of the composites included three relaxation processes in different temperature ranges, all of which were well described by the model.
JOURNAL OF ADVANCED DIELECTRICS
(2021)
Article
Chemistry, Physical
Constantino Grosse
Summary: The new version of the DielParamFit program enhances its applicability to a wide range of systems by allowing up to three Havriliak-Negami dispersions and providing a graphic interface for manually adjusting parameter values.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Stavroula Kapoulea, Ahmed S. Elwakil, Costas Psychalinos, Abdulwadood Al-Ali
Summary: Novel double-dispersion models based on power-law filters are introduced in this work without the use of fractional-order Laplacian operator, with the number of parameters depending on the selected combinations of mother filters. The validity of the proposed models is verified through fitting experimental bio-impedance data and compared to the classical double-dispersion Cole-Cole model for accuracy assessment.
CIRCUITS SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Physical
Sk. Anirban, Anindita Banerjee, Abhigyan Dutta
Summary: The synthesis route significantly influenced the structure, microstructure, and ionic transport properties of Ce0.8Gd0.2O1.9 ionic conductors. The citrate auto-ignition method resulted in higher density and Gd3+ ion dissolution, while the co-precipitation method produced finer nanomaterials. Each synthesis route also impacted the ionic conductivity, dielectric constant, and grain boundary conductivity of the samples.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Ceramics
Rajdip Roy, Abhigyan Dutta
Summary: This study investigated the effect of vanadium doping on the conductivity and relaxation dynamics of charge carriers in Sodium Bismuth Titanate perovskite material. The sample with 15% doping exhibited the highest conductivity and dielectric strength. Analysis of the conductivity mechanism using complex impedance method revealed comparable activation energies for conduction, relaxation, and migration of charge carriers.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Multidisciplinary
Sk Anirban, Abhigyan Dutta
Summary: This study investigates the structure and conduction mechanism of Sm2NiMnO6 prepared via auto-ignition method. The monoclinic structure with space group P2(1)/n was confirmed through Rietveld refinement of the XRD pattern. The room temperature conductivity was measured to be 1.6 x 10(-6) Omega(-1) cm(-1), indicating charge carriers conduction via hopping mechanism.
Article
Chemistry, Multidisciplinary
Arunmay Baidya, Abhigyan Dutta
Summary: The study successfully synthesized new material La6-xSmxMoO12 and investigated its structural and electrical properties. A red shift in optical band gap was observed at a certain dopant concentration, and the electrical conductivity showed a negative temperature coefficient.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Sk Anirban, Abhigyan Dutta
Summary: In this study, double perovskite Gd2NiMnO6 was prepared via auto-ignition method, demonstrating semiconductor properties with higher grain conductivity compared to grain boundary conductivity. The charge conduction mechanism was found to follow the non-overlapping small polaron tunnelling model.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Sk Anirban, Abhigyan Dutta
Summary: The study investigates the impact of sintering temperature on the structure, ionic conductivity, and dielectric properties of Ce0.8Y0.2O1.9. Conductivity and activation energy vary with sintering temperature, with highest and lowest values observed at 800 degrees C. Samples sintered at high temperatures exhibit lower conductivity and higher activation energy due to stable defect formation.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Sk Anirban, Abhigyan Dutta
Summary: The defect interaction mediated ionic conductivity of Ce0.9Sm0.1O1.95 is primarily determined by the concentration of free oxygen vacancies and the interaction with dopant cations. An increase in temperature results in a higher dielectric constant, leading to a decrease in dopant-vacancy association and an increase in ionic conductivity.
MATERIALS LETTERS-X
(2021)
Correction
Physics, Multidisciplinary
Sk Anirban, Abhigyan Dutta
Article
Materials Science, Ceramics
Sk. Anirban, Rajdip Roy, Abhigyan Dutta
Summary: This study investigates the properties of Dy2FeMnO6 synthesized by the auto combustion method, including its structure, microstructure, charge transport properties, dielectric properties, and leakage current density. The sample exhibits a monoclinic crystal structure with distorted and tilted CoO6 and MnO6 octahedra. The oxidation states of Fe and Mn are confirmed to be +3 and +3/+4, respectively. The sample shows non-overlapping small polaron tunnelling (NSPT) mechanism for charge conduction, and follows Jonscher's power law for frequency-dependent conductivity. The dielectric properties are described using Havriliak-Negami formalism, and the sample demonstrates Vogel-Fulcher law and ferroelectricity. The leakage current density is low, following Schottky emission.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Sujan Malik, Abhigyan Dutta
Summary: This study investigates the synthesis, characterization, and electrical properties of Gd2NiTiO6 (GNTO) double perovskite using the sol-gel citrate auto-ignition method. The structure, microstructure, and compositional distribution of the sample were analyzed through X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), and Energy Dispersive X-ray (EDX) analysis. The results confirmed a single-phase monoclinic structure with space group P21/n, and the electrical study revealed the thermally activated conduction mechanism and semiconductive character of the material. The frequency-dependent complex dielectric spectra were investigated using the Havriliak-Nigami (HN) formalism, and the temperature variation of leakage-current density was determined from J-E characteristics curves.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Sk. Anirban, Rajdip Roy, Abhigyan Dutta
Summary: This study investigates the structure, charge transport properties, dielectric properties, and leakage current density of Dy2CoMnO6 double perovskite. The sample is prepared using the auto-ignition method. The analysis reveals the distorted and tilted crystal structure of the sample, with Co and Mn having oxidation states of +3 and +4. The charge carrier conduction follows a correlated barrier hopping mechanism, and the grain boundary conductivity is higher than the grain interior conductivity. The sample exhibits a non-Debye type dielectric nature. The characteristics of the leakage current density and its interrelation with the conduction processes are also discussed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Arunmay Baidya, Abhigyan Dutta
Summary: The solution combustion method was used to prepare a single-phase La6MoO12 compound doped with 10% Dy. The samples were sintered at different temperatures and their phase transition, microstructure, optical properties, and ionic conductivity were investigated. The results showed that the sintering temperature played a significant role in determining the structural and functional properties of the samples.
SOLID STATE SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Arunmay Baidya, Abhigyan Dutta
Summary: Room temperature single phase stabilization of different metals (Zr, Cd, and Ca)-doped La6MoO12 compound was achieved by incorporating Dy2O3. The X-ray diffraction profiles confirmed the cubic fluorite (Fm3m) structure. The optical bandgap decreased with decreasing dopant ionic radius. The photoluminescence spectra indicated various trapping or defect states for the charge carriers. The complex impedance plot showed non-Debye-type relaxation and negative temperature coefficient of resistance (NTCR), suggesting the dopant's role as an acceptor or donor. The ac conductivity followed the small polaron hopping mechanism, and a thermally activated single relaxation process was observed. The composition La5.4Dy0.4Zr0.2MoO12.1 exhibited the highest conductivity at 680 degrees C.
MATERIALS RESEARCH BULLETIN
(2023)
