Article
Materials Science, Ceramics
Sushmita Dwivedi, Manish Badole, Hari Narayanan Vasavan, Sunil Kumar
Summary: The electrical conduction behavior of lead-free BiZnNbO ceramics annealed in different atmospheres was studied, with the sample annealed in oxygen environment showing the lowest conductivity due to reduced oxygen vacancy defects. An anomaly observed at 250 degrees Celsius in dielectric plots for certain samples was attributed to defect relaxation.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
B. M. G. Melo, D. Blaskova-Kochnitcharova, S. Soreto Teixeira, E. Lefterova, P. Petkov, T. Petkova, L. C. Costa
Summary: Bulk samples of the ternary TiO2-V2O5-P2O5 system were synthesized using the melt-quenching technique. The structure and composition were identified using X-ray diffraction and scanning electron microscopy, with dielectric properties measured using impedance spectroscopy. Analysis of impedance spectra indicated a grain conductivity of 10-1 S/m at 190 degrees Celsius for the NASICON sample.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
S. S. Aplesnin, L. Udod, M. N. Sitnikov, O. B. Romanova
Summary: This study investigated the electrical characteristics of Bi2Sn2-xFexO7 (x = 0.1, 0.2) stannates, including electrical resistance, impedance, I-V characteristics, capacitance, and more, and established correlations between certain characteristics and phase structure transitions.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Alexander Komar, Dirk Wilmer, Martin R. Wilkening, Ilie Hanzu
Summary: The determination of stray capacitance in impedance measuring cells is crucial for studying solid ion conductors. We present a general method that accurately determines stray capacitance and can be applied to various impedance cells or sample holders for temperature conductivity measurements. Experimental calibration on a 2032-type coin cell sample holder demonstrates the reliability of our method for impedance measurements of air sensitive materials. Our method serves as an example of good practice in the field of solid electrolytes, solid state batteries, and dielectric materials investigations.
SOLID STATE IONICS
(2023)
Article
Materials Science, Ceramics
Vitoria Mussi Toschi, Christine Bogicevic, Houssny Bouyanfif, Henri Laville, Pierre-Eymeric Janolin
Summary: The study shows that nominal stoichiometry, phase separation, and metallization method significantly impact the dielectric properties of NBT-6BT material. Increasing the Na/Bi ratio leads to higher conductivity, dielectric losses, depolarization temperature, and lower temperature of maximum permittivity. Phase separation during synthesis results in secondary Ba-containing phases that can positively affect dielectric properties. The method of metallization also influences the dielectric properties, contributing to discrepancies in reported results.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Inorganic & Nuclear
S. J. Sondarva, D. V. Shah
Summary: This study synthesized polycrystalline Mn3-xCrxTeO6 (MCTO) compounds using the SSR method and investigated the non-Debye relaxation mechanism and correlated barrier hopping mechanism in Cr-doped MCTO compounds, laying the foundation for their applications in the field of multiferroics.
SOLID STATE SCIENCES
(2022)
Article
Physics, Multidisciplinary
A. A. A. Darwish, Saleem Qashou, E. F. M. El-Zaidia, K. F. Abd El-Rahman, Taymour A. Hamdalla, S. A. Al-Ghamdi, Abdulrhman M. Alsharari, Syed Khasim, Ahmed Obaid M. Alzahrani, I. S. Yahia
Summary: Through thermal evaporation, boron subphthalocyanine chloride (B-subPcCl) films were created, with an amorphous nature and surface composed of homogeneous elliptical nanoparticles. Impedance measurements showed that the transport charge mechanism is dominated by the correlated barrier hopping (CBH) model. The variation of dielectric constant and dielectric loss with frequency demonstrated a significant decrease as frequency increased, with a relaxation process in the imaginary modulus.
Article
Chemistry, Physical
S. J. Sondarva, D. Shah
Summary: In this study, the complex oxide Mn3TeO6 (MTO) compound was synthesized using solid-state reaction method at high processing temperature. The material was characterized in terms of structure, morphology, and electrical properties. The dielectric constant and conductivity of the compound were found to increase with temperature, indicating a correlated barrier hopping mechanism responsible for conduction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Xavier Vendrell, Julia Ramirez-Gonzalez, Zuo-Guang Ye, Anthony R. West
Summary: In this study, impedance measurements and equivalent circuit analysis were used to reveal the key role of a constant phase element in the behavior of relaxor ferroelectric materials. This finding is significant for understanding the relaxation mechanisms and controlling the characteristics of relaxor materials.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Physical
Shigeru Katsuyama, Kohei Kamoya
Summary: A sintered composite made of p-type Si0.99B0.01 and insulative SiO2 particles was studied for its thermoelectric properties. The electrical conductivity and thermal conductivity of the composite were found to change with the volume fraction of Si0.99B0.01, showing specific trends at different stages of volume fraction increase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Tosapol Maluangnont, Phieraya Pulphol, Satana Pongampai, Thawanrat Kobkeatthawin, Siwaporn Meejoo Smith, Naratip Vittayakorn
Summary: In this study, the impedance spectroscopy of carbon nitride nanosheets (CNNS) and the composite with anatase (TiO2/CNNS) were investigated, along with their interaction with atmospheric water. The results showed that CNNS is highly insulating, while the incorporation of TiO2 nanoparticles significantly reduced the resistivity of the composite and the decrease in resistivity was proportional to the exposure time to atmospheric water. This study provides important insights into the water-induced transport of TiO2/CNNS composite without the need for complicated curve fitting procedures or dedicated humidity control.
Article
Chemistry, Physical
B. Gowtham, V Balasubramani, S. Ramanathan, Mohd Ubaidullah, Shoyebmohamad F. Shaikh, Gedi Sreedevi
Summary: Impedance spectroscopy was used to measure the electrical conductivity and dielectric properties of WO3 nanostructures, revealing that the conductivity is influenced by frequency and temperature. The frequency exponent 's' decreases with increasing temperature, indicating the presence of the correlated barrier hopping mechanism in WO3 nanostructures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
R. Dhahri, M. A. Valente, P. Graca, B. F. O. Costa
Summary: La0.67Ca0.2Ba0.13Fe1-xTixO3 samples were synthesized and their dielectric properties and conduction mechanisms were studied. The results showed that the materials exhibited semiconductor behavior with an increase in conductivity at higher temperatures. Nyquist diagrams indicated contributions from grains and grain boundaries, and dielectric analysis confirmed theoretical predictions. The low conductivity and high dielectric constant make this material a potential candidate for energy storage and electronic devices and microwaves applications.
Article
Chemistry, Multidisciplinary
Kawthar Trabelsi, Karim Karoui, Abdelfattah Mahmoud, Frederic Boschini, Abdallah Ben Rhaiem
Summary: Na2Co1-xFexSiO4 (NCFS)-based ceramics show great promise as alternatives to sodium-ion rechargeable batteries (SIBs). The defect chemistry and doping impact of iron on Na2CoSiO4 (NCS) can improve the intrinsic qualities of the material. In this study, Na2Co1-xFexSiO4 with x = 0.1 and 0.2 samples were examined to understand their structural characteristics, optical properties, ionic conductivities, and sodium migration. It was found that the Fe doping resulted in an orthorhombic phase with improved conductivity. The frequency dependence of ac conductivity was also analyzed to identify conduction mechanisms.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Physics, Condensed Matter
H. Shivashankar, A. M. Kevin, S. B. S. Manohar, S. M. Kulkarni
Summary: Polymer nanocomposites are being used in energy storage, sensors, and actuators with improved dielectric properties such as permittivity and conductivity. The incorporation of carbon black particles marginally enhances the dielectric permittivity while causing strong frequency dependence in AC conductivity. Empirical and experimental inspections are crucial for designing electronic devices based on polymers.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Subhojyoti Sinha, Sanat Kumar Chatterjee, Jiten Ghosh, Ajit Kumar Meikap
CURRENT APPLIED PHYSICS
(2015)
Article
Materials Science, Multidisciplinary
A. K. Das, S. Sinha, A. Mukherjee, A. K. Meikap
MATERIALS CHEMISTRY AND PHYSICS
(2015)
Article
Materials Science, Composites
Subhojyoti Sinha, Sanat Kumar Chatterjee, Jiten Ghosh, Ajit Kumar Meikap
POLYMER COMPOSITES
(2017)
Article
Physics, Applied
Subhojyoti Sinha, Amit Kumar Das, Soumen Basu, Ajit Kumar Meikap
JAPANESE JOURNAL OF APPLIED PHYSICS
(2017)
Article
Physics, Applied
Subhojyoti Sinha, Sanat Kumar Chatterjee, Jiten Ghosh, Ajit Kumar Meikap
JOURNAL OF APPLIED PHYSICS
(2013)
Article
Materials Science, Multidisciplinary
Subhojyoti Sinha, Sanat Kumar Chatterjee, Jiten Ghosh, Ajit Kumar Meikap
JOURNAL OF MATERIALS SCIENCE
(2015)
Article
Physics, Condensed Matter
Subhojyoti Sinha, Sanat Kumar Chatterjee, Jiten Ghosh, Ajit Kumar Meikap
PHYSICA B-CONDENSED MATTER
(2014)
Article
Nanoscience & Nanotechnology
N. Chakrabarty, A. Mukherjee, S. Sinha, S. Basu, A. K. Meikap
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2014)
Article
Chemistry, Physical
Subhojyoti Sinha, Gourab Dutta, Ramanjaneyulu Mannam, Nandita DasGupta, M. S. Ramachandra Rao
APPLIED SURFACE SCIENCE
(2020)
Article
Chemistry, Physical
Riju Karmakar, Subhojyoti Sinha, Amit Kumar Das, Bilwadal Dutta, Subhamay Pramanik, Probodh Kumar Kuiri, Ajit Kumar Meikap
Summary: In this article, the water molecules mediated charge transportation kinetics in Polyvinyl alcohol (PVA)-Cobalt Oxide (CO3O4) flexible nanocomposite films were explored. The comprehension of surface and interface chemistry is crucial for understanding the chemical interactions at the aqueous hydrophilic PVA-Co3O4 interface. The dissociation of water molecules following the fragmentation of inter/intramolecular dangling bonds is correlated with the water diffusion kinetics and saturation in the sorption capacity of water-swollen PVA-Co3O4 nanocomposite films. The trap-states development due to the interfacial charge accumulation, after absorption of water molecules, are favourable for the trap-assisted space charge limited current conduction (TA-SCLC) mechanism and increase current density.
SURFACES AND INTERFACES
(2023)
Article
Electrochemistry
Owais Amin, Subhojyoti Sinha, Partha Sona Maji, Rupam Mukherjee
Summary: We investigated the influence of indium doping on the thermal stability and ionic conductivity of beta alumina NaInxAl11-xO17 solid electrolyte. The samples were synthesized by sol-gel autocombustion method with varying dopant concentration. XRD and FESEM analyses showed changes in unit cell volume and morphology with increasing dopant concentration. The thermal stability of beta-alumina improved significantly even at low dopant concentrations. EIS measurements indicated a considerable reduction in frequency-dependent dielectric permittivity for doped beta alumina.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Riju Karmakar, Amit Kumar Das, Bilwadal Dutta, Subhojyoti Sinha, Saikat Santra, Subhamay Pramanik, Probodh Kumar Kuiri, Ajit Kumar Meikap
Summary: In this study, flexible and free-standing polyvinyl alcohol (PVA)-zirconia nanocomposite films were synthesized and evaluated as a potential material for next-generation resistive switching devices. The nanocomposite films exhibited high resistive and low resistive states within a voltage window of 5 V. The origin of trap-assisted SET/RESET potentials was experimentally validated, and the impregnation of zirconium dioxide (ZrO2) nanoparticles enhanced interfacial charges. The current-voltage characteristics showed tunable SET/RESET potential, good resistance ratio, and excellent cycling ability of the PVA-ZrO2 nanocomposite films.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Proceedings Paper
Physics, Applied
Amit Kumar Das, Subhojyoti Sinha, Ajit Kumar Meikap
PROCEEDINGS OF THE 59TH DAE SOLID STATE PHYSICS SYMPOSIUM 2014 (SOLID STATE PHYSICS)
(2015)
Proceedings Paper
Physics, Applied
Subhojyoti Sinha, Sanat Kumar Chatterjee, Jiten Ghosh, Ajit Kumar Meikap
SOLID STATE PHYSICS: PROCEEDINGS OF THE 58TH DAE SOLID STATE PHYSICS SYMPOSIUM 2013, PTS A & B
(2014)