Article
Materials Science, Multidisciplinary
Asma Aslam, Atta Ur Rehman, N. Amin, M. Amman, M. Akhtar, N. A. Morley, Merfat S. Al-Sharif, M. M. Hessien, Khaled A. El-Nagdy, Muhammad Imran Arshad
Summary: Tertiary spinel ferrite powders doped with Cd2+ were prepared using a cost-effective sol-gel auto combustion route, and their properties were characterized. The Cd2+ doped ferrite exhibited smaller crystallite size, lower resistivity, smaller AC conductivity, and dielectric loss compared to Mg2+ and Mn2+ doped ferrites. These findings suggest that Cd2+ doped ferrites could be suitable for high-frequency and high-power applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Physics, Applied
S. N. Holmes, J. Gough, C. Chen, D. A. Ritchie, M. Pepper
Summary: The study found that n-type doped InSb wafers can exhibit variable range hopping transport mechanism induced by Ga+ ion beam damage, with high damage levels showing three-dimensional behavior and lower doses displaying characteristics of Mott phonon-assisted VRH. Controlling the level of damage can alter the transport properties of the devices, allowing for the study of coherent transport processes in the hopping regime.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Ceramics
Oguz Karaahmet, Bugra Cicek
Summary: In this study, a polymeric precursor was synthesized from industrial raw materials by the sol-gel method and mechanically modified to improve the crystallinity and decrease the particle size of the resulting B4C powder. The bimodal structure of the reactant transformed into a bicontinuous structure, and the resulting B4C powder had less free carbon compared to the powder prepared without mechanical modification.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Lalita Chauhan, Sudhanshu Kumar, K. Sreenivas, A. K. Shukla
Summary: This study on nickel ferrite ceramics revealed multiple relaxations in dielectric, impedance, and modulus spectra, indicating different conduction mechanisms at varying temperatures. Multiple relaxations were observed due to hopping of holes and electrons, with defect hopping only seen at higher temperatures.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Review
Chemistry, Multidisciplinary
Ozge Payanda Konuk, Ala A. A. M. Alsuhile, Hamed Yousefzadeh, Zeynep Ulker, Selmi E. Bozbag, C. A. Garcia-Gonzalez, I. Smirnova, Can Erkey
Summary: Aerogels are unique nanoporous materials with properties such as low density, high porosity, high specific surface area, and interconnected pore networks, making them suitable for various applications including adsorption, thermal insulation, catalysts, tissue engineering, and drug delivery. The physical and chemical properties, as well as pore structure of aerogels, are crucial in determining their application areas, and can be tailored to meet specific requirements for each application. Furthermore, the synthesis conditions and process parameters for tailoring aerogel properties, from precursor dissolution to supercritical drying, have been investigated in the literature.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Physical
Jicheng Zhang, Qi Yang, Jiankun Wu, Jia Li, Zhaoguo Li
Summary: The electrical transport properties of zirconium oxynitride films are investigated, and a transition from positive to negative magnetoresistance is observed in the variable-range hopping transport regime with decreasing temperature. The positive magnetoresistance is caused by the shrinkage effect of electronic wavefunctions, while the negative magnetoresistance, independent of magnetic field orientations, can be attributed to Zeeman splitting and/or spin-flip hopping effect of localized states. Further experimental studies are required to elucidate the exact transition mechanism.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Mujdat Caglar, Kivanc Sever, Seda Aktas, Arsen Demiroglu
Summary: In this study, NiO films with different Al doping ratios were deposited on glass and n-type Si substrates using the sol-gel process. The physical and electrical characterizations of the films were investigated, with a focus on the effect of Al doping. The results showed that increasing Al doping resulted in a decrease in crystallinity and an increase in band gap. X-ray photoelectron spectroscopy analysis revealed the presence of both Ni+2 and Ni+3 ions in the undoped NiO lattice, with Ni+2 being reduced due to Al+3 substitution. The heterojunction photodiodes based on NiO films showed good rectifying properties, with ideality factor and barrier height decreasing and rectification ratios increasing with increasing Al doping. The photosensitivity increased but photoresponse decreased with increasing Al doping.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Ceramics
Taotao Hu, Wenzhi Huang, Ruiqi Zhong, Jindong Zhang, Na Zeng, Yangyang Wang, Wanyu Liu
Summary: LaMgAl11O19:Eu3+ (LMA:Eu3+) nano-powders were synthesized via sol-gel process, and the crystal growth activation energy was decreased by adding ethanol. The lowest activation energy of 57.95 +/- 2.62 kJ/mol was achieved with a water/ethanol volume ratio of 1:3 and an AcOH/metal ions molar ratio of 1:1. However, the phase composition and micro-structure of the powders were less affected by the addition of organic additives. The LaMgAl11O19:Eu3+ powders exhibited orange-red emission under ultraviolet light excitation.
CERAMICS INTERNATIONAL
(2023)
Review
Physics, Condensed Matter
Miguel Ortuno, Francisco Estelles-Duart, Andres M. Somoza
Summary: This review examines numerical simulations of variable-range hopping in 2D and 3D systems with localized states due to disorder, considering both interacting and noninteracting systems. It discusses the main theories for variable-range hopping, such as Mott's and Efros and Shkolvskii's, and presents numerical techniques used for this problem. The focus is on the proportionality constant's impact on characteristic temperatures in different conduction laws and the form of the pre-exponential factor.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Chemistry, Physical
Zi Ang Chen, Xinfeng Yan, Mingjia Zhi
Summary: Thermal reduction of sol-gel derived CuWO4 creates Cu-WO3_x composite with enhanced visible light absorption and a metal-metal oxide interface, leading to improved photocatalytic activity in the non-oxidative coupling of methane reaction. This is attributed to the abundant oxygen vacancies and additional visible light absorbance provided by the Cu nanoparticles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2024)
Article
Physics, Multidisciplinary
Nooshin Aghashahi, Mohammad Reza Mohammadizadeh, Parviz Kameli
Summary: This study analyzed samples obtained by reducing Rutile TiO2 with Mg to determine the suboxide phases and dominant structural phase in each sample. The results showed that increasing the heat treatment temperature or the amount of reducing agent led to an increase in the amount of suboxide phases and TiO being the main phase in samples with low electrical resistivity. The hopping conduction mechanism was investigated and characterized, showing a transition from nearest neighbor hopping to Mott-variable range hopping conduction regimes at around 65 K. The Efros-Shklovskii VRH conduction process was observed at low temperatures below 18 K. The obtained hopping parameters indicated that the low resistivity samples were close to the metal-insulator transition. In samples with high electrical resistivity, the hopping conduction relations did not fit the resistivity-temperature curves, possibly due to resistive switching behavior and changes in conductivity properties depicted in the current-voltage curve.
Article
Chemistry, Physical
Song Yi Back, Hyunyong Cho, Jong-Soo Rhyee
Summary: The study investigated the electrical transport properties of In1-xPbxTe compounds, finding that small Pb doping induces charge localization and leads to variable range hopping transport. The transition from Mott to Efros-Shklovskii type VRH transport was observed with decreasing temperature, along with unconventional negative MR behavior in Pb-doped compounds. The results suggest strong electron-electron Coulomb interactions and significant changes in density of states in these compounds.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Ying Zhao, Jiawei Wang
Summary: Investigated the effect of carrier concentration on the Seebeck coefficient in Gaussian disordered organic semiconductors (GD-OSs), and developed a general model to predict the thermoelectric properties and explain experimental data, which deepens our understanding of charge transport in organic semiconductors and provides guidance for optimizing thermoelectric device performance in disordered systems.
Article
Chemistry, Physical
Wenping Geng, Dongwan Zheng, Xiaojun Qiao, Xiangjian Wang, Le Zhang, Kaixi Bi, Jian He, Xiujian Chou
Summary: Antiferroelectric thin films exhibit outstanding negative electrocaloric effect and show potential as candidates for solid-state refrigeration technology. The use of composite electrodes can result in better electric conductivity and a larger negative electrocaloric effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Jiaojiao Yi, Lisha Liu, Liang Shu, Yu Huang, Jing-Feng Li
Summary: This study achieves reliable ferroelectric properties in sol-gel processed BiFeO3 films by using a protective layer and O-2 annealing. The remnant polarization of the films is significantly improved, resulting in reliable ferroelectricity in a wide thickness range.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Multidisciplinary
R. Bharath Kumar, P. Suresh, P. Raja, S. Sivaperumal
Summary: This article discusses the vital role of engineers in the biomedical field, particularly in medical diagnosis related to anesthesia drugs. It provides detailed information on the determination of anesthesia dosage and the effects and side effects of anesthesia drugs. Additionally, it reviews the use and limitations of artificial intelligence in anesthesia.
INTERNATIONAL JOURNAL OF SYSTEM ASSURANCE ENGINEERING AND MANAGEMENT
(2023)
Article
Physics, Condensed Matter
R. Maruthi, Mohindar S. Seehra, Sayandeep Ghosh, Rohit Medwal, Rajdeep S. Rawat, Bruno Weise, Eun Sang Choi, Subhash Thota
Summary: By analyzing the temperature and magnetic field dependence of magnetization in MnTa2O6, the magnetic field-temperature phase diagram, tricritical point, and exchange constants were determined. Experimental results were consistent with theoretical predictions and previous studies, confirming the phase purity of the material.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Applied
S. Das, R. G. Tanguturi, S. Ghosh, R. K. Dokala, R. Medwal, S. Gupta, Z. Yan, Y. Qi, R. S. Rawat, S. Thota
Summary: This study investigates the orientation dependent growth characteristics, electronic structure, transport, magnetic, and vibrational excitations of [La0.7Sr0.3MnO3/LaNiO3](10) superlattices on SrTiO3 substrates. The results reveal differences in electrical resistivity, ferromagnetism, and vibrational excitations among superlattices grown on different orientations.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Computer Science, Information Systems
Mujahid Tabassum, Sundresan Perumal, Saad Bin Abdul Kashem, Suresh Ponnan, Chinmay Chakraborty, Muhammad E. H. Chowdhury, Amith Khandakar
Summary: IoT networks are widely used in various industries. WSN is a self-managing network that is ideal for agricultural monitoring. Data handling, energy limitations, bandwidth, computing capacity, and link failure all have an impact on network performance.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Computer Science, Information Systems
M. Lordwin Cecil Prabhaker, Suresh Ponnan
Summary: This paper introduces the application of AI-based multi-objective evolutionary algorithm techniques in low power biomedical devices for real-time task scheduling. By considering multiple objectives, this technique improves performance and reduces power consumption.
MULTIMEDIA TOOLS AND APPLICATIONS
(2022)
Article
Computer Science, Hardware & Architecture
Suresh Ponnan, J. Robert Theivadas, V. S. HemaKumar, Daniel Einarson
Summary: Intelligent transport systems (ITS) use wearable devices to monitor driver health, provide emergency aid, and advertise. It allows multitasking, such as finding tourist spots and ordering food, while also controlling vehicle operations. To address the lack of medical facilities in current ITS, a wearable device for autonomous vehicle driver health and passenger interaction system is developed. This experiment also determines the optimal age group for handling multiple services simultaneously.
COMPUTERS & ELECTRICAL ENGINEERING
(2022)
Article
Physics, Applied
R. Maruthi, S. K. Deshpande, V Deshmukh, K. Singh, S. Thota
Summary: A comprehensive study on ac-charge transport and dielectric relaxation in the MnNb2O6 columbite system was conducted. The study found that the ac-conductivity exhibited thermally driven, Arrhenius-like behavior with activation energies ranging from 0.45 to 0.38 eV. The analysis of the measured data revealed the dispersive behavior of the electrical conductivity and provided evidence for the correlated-barrier hopping (CBH) conduction mechanism. The study also investigated the dynamical response of the complex electric modulus spectra and identified a non-Debye type relaxation process.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Mouli Roy-Chowdhury, Suchit Kumar Jena, Vedant Pramod Khadse, Deep Chandra Joshi, Subhash Thota
Summary: This study presents a comprehensive investigation on the structural, magnetic and dielectric properties of ferrite cuprospinels with site specific substitution of non-magnetic Zn and weakly magnetic Ru ions. The study reveals that such substitution leads to stable crystal symmetries, significant Jahn-Teller distortion, ferrimagnetic behavior, and antiferromagnetic ordering. The investigated systems also exhibit significant magneto-crystalline anisotropy and enhancement of mid-frequency dielectric constant with low-loss.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Condensed Matter
S. K. Jena, M. S. Seehra, T. Sarkar, M. Reehuis, A. Hoser, B. Weise, S. Thota
Summary: In this study, the magnetic properties of the tetragonal spinel Zn0.8Cu0.2FeMnO4 were investigated. The results showed complex temperature-dependent short-range order without long-range order. The temperature dependence of magnetization followed the Curie-Weiss law, indicating dominant ferromagnetic coupling. The temperature dependence of ac magnetic susceptibility revealed the presence of ferrimagnetism and peaks near 47 K and 24 K, indicating a cluster spin-glass state. The magnetic field dependence of the spin-glass temperature exhibited hysteresis behavior. The heat capacity measurements showed a broad weak peak characteristic of short-range order. Below 9 K, the heat capacity varied as T-2, indicating spin-liquid behavior. Neutron diffraction measurements confirmed the absence of long-range order. Thermo-remanent magnetization studies revealed a weakening of inter-cluster interaction with increasing temperature. In summary, Zn0.8Cu0.2FeMnO4 exhibits ferromagnetic clusters that interact antiferromagnetically without long-range order, resulting in a cluster spin-glass state and spin-liquid behavior below 9 K.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
P. Tiwari, A. D. Singha, S. A. Atkar, A. Datta, S. Thota
Summary: We report the mixed valence and intermediate spin-state transitions in Pr substituted LaCoO3 perovskites. Structural analysis shows a phase crossover in both bulk and nanostructures. Magnetization measurements reveal the coexistence of ferromagnetic and weak antiferromagnetic components in bulk LaCoO3. The incorporation of Pr leads to the development of a strong antiferromagnetic component and enhances the ordering temperatures. The optical energy band gap decreases with the incorporation of Pr, as confirmed by Kubelka-Munk analysis.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
R. K. Dokala, S. Das, P. K. Mishra, S. Thota
Summary: This study investigates the properties of tetragonal Zirconite (Y1-xCeCrO4)-Cr-x polycrystals synthesized at different temperatures. The introduction of magnetic Ce3+ in place of Y3+ ions reduces the ferromagnetic behavior and results in weak antiferromagnetic behavior. The study also reveals the influence of magneto-crystalline anisotropy and the emergence of intermediate localized states upon substitution of Ce3+.
Article
Chemistry, Analytical
M. Muthumanikkam, Alagu Vibisha, Michael Cecil Lordwin Prabhakar, Ponnan Suresh, Karupiya Balasundaram Rajesh, Zbigniew Jaroszewicz, Rajan Jha
Summary: This study presents a simple hybrid structure of TiO2-Cu-BaTiO3 that demonstrates high sensitivity and resolution for biosensing applications using an angular interrogation method. Copper (Cu) has been identified as an excellent choice for surface plasmon sensors (SPR) due to its ability to produce finer SPR curves compared to Ag and Au. To overcome copper oxidation, a protective layer of barium titanate (BaTiO3) is incorporated, which not only prevents oxidation but also enhances sensor performance. The addition of a thin adhesive layer of titanium dioxide (TiO2) between the prism base and Cu film further improves sensor performance. Upon optimization, this configuration achieves a sensitivity as high as 552 RIU with a figure of merit (FOM) of 136.97 RIU-1, making it an ideal biosensor design for long-term detection with enhanced accuracy and sensitivity, even using Cu as a plasmonic metal.
Article
Materials Science, Multidisciplinary
S. Das, R. K. Dokala, B. Weise, P. K. Mishra, R. Medwal, R. S. Rawat, S. Thota
Summary: We investigate the temperature dependence of selective phonon scattering and magnetization switching in (GdSm)CrO3 perovskites. The results show strong spin-phonon coupling and anomalous change of key phonon modes across the antiferromagnetic Neel temperature. The substitution of Sm at Gd sites leads to interesting features such as enhanced ordering temperatures and multiple magnetization switching. The system also exhibits bipolaThe investigation of temperature dependence of selective phonon scattering and magnetization switching in (GdSm)CrO3 perovskites is reported. The results indicate strong spin-phonon coupling and anomalous change of key phonon modes across the antiferromagnetic Neel temperature. The substitution of Sm at Gd sites results in interesting features including enhanced ordering temperatures and multiple magnetization switching. The system also shows field-dependent bipolar switching of magnetization, making it a potential candidate for magnetic memories and switches.r switching of magnetization at different temperatures below T-N, making it a suitable candidate for magnetic memories and switches.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Cho Sandar Htet, S. Nayak, Alicia Manjon-Sanz, J. Liu, J. Kong, D. R. Sorensen, F. Marlton, M. R. V. Jorgensen, A. Pramanick
Summary: Sodium niobate (NaNbO3 or NN) is a complex perovskite system that exhibits transitions between multiple ferroelectric and antiferroelectric phases. Understanding the atomic mechanisms behind these phase transitions can aid in the design of solid-solution systems with tunable functional properties.
Article
Chemistry, Physical
Aneeta Manjari Padhan, Sugato Hajra, Jagadish Kumar, Manisha Sahu, Sanjib Nayak, Hamideh Khanbareh, Hoe Joon Kim, Perumal Alagarsamy
Summary: This work presents a detailed study on the reduction process of NiO-Ti to synthesize NiO-Ni-TiO2 nanocomposites with enhanced magnetic and dielectric properties, showing potential for improving the performance of TENGs. The polarization and magnetization contribute to the enhanced triboelectric performance.
SUSTAINABLE ENERGY & FUELS
(2022)