Article
Materials Science, Ceramics
M. Kamran, M. Anis-ur-Rehman
Summary: This study investigates the electrical properties of cerium-doped Co-ferrite nanoparticles and discovers their resistive switching effect. With increasing cerium substitution, the resistance, drift mobility, and dielectric constant decrease, while the activation energy increases. The study also finds that the sample with a cerium composition of x = 0.25 exhibits a larger hysteresis loop, making it suitable for nonvolatile ReRAM applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
M. Sameeh, M. Khairy, T. Esawy, W. A. A. Bayoumy
Summary: The nanocrystalline ZnMn2-xCrxO4 (x = 0, 1, 2) were successfully synthesized by combustion method. The prepared samples exhibited super-paramagnetic behavior and semiconductor properties, with increasing electrical conductivity at higher temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Bappa Sona Kar, M. N. Goswami, P. C. Jana
Summary: La2O3-substituted polycrystalline 0.56BiFeO(3)-0.44BaTiO(3) ceramics were prepared via conventional solid-state reaction process, with investigations on crystal structure, dielectric, magnetic, and impedance properties. La substitution enhanced the multiferroic nature of the materials, as evidenced by improved energy storage density and remnant magnetization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Manoj Kumar Rout, Sunita Keshri
Summary: The paper focuses on the study of cation distribution and impedance spectroscopy analysis of pristine and rare earth ions (La3+ and Dy3+) doped Co0.7Zn0.3Fe2O4 ferrite nanocrystals. The samples have a single phase spinel cubic structure with a confirmed space group Fd3m. The cation distribution property of these compositions has been studied using XRD and Raman spectra data. The doped samples exhibit higher dielectric constant and lower loss compared to the parent sample, making them suitable for microwave devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Vivek Kumar, Sudha Saini, Tanmoy Maiti
Summary: The conduction mechanism in BaxSr2-xCrMoO6 double perovskite was investigated using various techniques. Thermally activated and frequency-dependent conduction was found. The grain boundaries exhibit higher resistance and capacitance than the grains. Both short- and long-range charge carrier transport contribute to conduction in these oxides. The impedance data was validated using Kramers-Kronig relation and conductivity scaling.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Santhosh M. Kumar, Hassan A. H. Alzahrani, G. J. Shankaramurthy, K. K. Nagaraja, Abdulmohsen O. Alsaiari, B. M. Prasanna, N. Chandamma
Summary: In this study, the effect of gamma-irradiation on the structural and AC electrical properties of Ni-Zn nanoparticles was investigated. XRD analysis showed a decrease in crystallite size with increasing Zn2+ ion concentration, and irradiation influenced the crystallite size. The lattice constant increased with Zn2+ concentration, but changes occurred after irradiation. Irradiation also affected the lattice strain and morphology of the samples. In terms of AC electrical properties, irradiation increased the dielectric constant but decreased the dielectric loss and AC conductivity, and the type of dielectric relaxation changed.
Article
Chemistry, Applied
Salma Aman, Naseeb Ahmad, M. H. Alhossainy, Hind Albalawi, Manal Morsi, Tahani Al-Muhimeed, Abeer A. AlObaid
Summary: The ferrite series SrYbyFe2-yO4 (y = 0.00 to 0.10) were synthesized via the sol-gel procedure. The involvement of yttrium in the base composition resulted in changes in the structural, magnetic, and electrical properties of the system. X-ray diffraction analysis confirmed the cubic structure of all samples. The coercivity increased and the saturation and remanence magnetization values decreased with the involvement of Yb-ions. The permittivity values decreased and the impedance value increased with higher Yb-ion concentration.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Inorganic & Nuclear
J. Lakshmikantha, G. Krishnamurthy, B. M. Nagabhushan, E. Melagiriyappa
Summary: Nanosized M-type hexaferrites Sr(1-x)GdxFe12O19 were synthesized and the influences of Gd3+ ions substitution on their structural, electrical and magnetic properties were investigated. The study found that increasing Gd3+ ion content resulted in larger lattice parameters, decreased dielectric constant, increased AC conductivity, and decreased magnetic parameters. In addition, vibrating sample magnetometer analysis confirmed the hard magnetic behavior of M-SrHF.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Review
Materials Science, Multidisciplinary
Fiaz Ahmad, Asghari Maqsood
Summary: A low-cost and low-temperature co-precipitation process was used to synthesize zinc oxide (ZnO) nanoparticles, which were characterized using various techniques at room temperature. The study also reported the electrical properties, dielectric parameters, and complex impedance spectra at low temperatures, revealing the conduction mechanism in ZnO nanoparticles as the Correlation Barrier Hopping (CBH) mechanism.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Materials Science, Ceramics
Rohit Jasrotia, Pooja Puri, Virender Pratap Singh, Rajesh Kumar
Summary: Magnesium nanoferrites with manganese and silver substitutions were synthesized and studied for their electrical and dielectric properties. The materials exhibited high dielectric constant and low dielectric losses, making them suitable for power applications.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Condensed Matter
Subhajit Raut, Hari Sankar Mohanty, Biman Kar, Simanchalo Panigrahi
Summary: Detailed ac electrical investigations were conducted on polycrystalline YFe0.9Cr0.1O3 samples prepared via solid state reaction route within the frequency range 100 Hz-1 MHz, at a broad thermal interval of 298-673 K. The research observed systematic development of grain, grain boundary, and electrode polarization contribution with increasing temperature. The thermal variation of the grain resistance and grain boundary resistances followed the non-adiabatic small polaron hopping model and contributed to long-range conduction with different activation energies at different thermal regimes. The ac conductivity exhibited series of dispersive regions with broad region below 473 K, and significant dc conductivity was observed above 473 K. Different dispersive regions in the conductivity spectrum followed single power law and power law variation (A omega n).
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Sk Yasnur, Prasenjit Maji, Apurba Ray, Himadri Mullick, Sachindranath Das
Summary: Different phases of iron oxide were successfully synthesized by sol-gel auto combustion route in this study, and the temperature and frequency-dependent dielectric properties were carefully studied to understand the contribution of grain and grain boundary in charge transport. The activation energy for α-Fe2O3 was calculated as 1.36 eV using complex impedance spectra, showing that the distribution of relaxation time is temperature independent.
Article
Materials Science, Multidisciplinary
E. M. Kamar, M. Khairy, M. A. Mousa
Summary: Four different samples of Nickel ferrite (NiFe2O4) with varied morphology and nanoparticle size were synthesized using different methods: electrospinning, hydrothermal, green, and sol-gel. Characterization of the prepared powders was performed through XRD, FT-IR, SEM, TEM, and BET techniques. The ferrite exhibited a cubic spinel phase with nanofiber, nanotube, nanorod, and nanosphere structures. The conductivity values were dependent on the size and morphology of the nanoparticles, and their semiconducting behavior was observed. The dielectric constant, dielectric loss, and ac conductivity of the samples at different temperatures and frequencies were studied.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Electrical & Electronic
Mohsen Elain Hajlaoui, Essebti Dhahri, Kamel Khirouni
Summary: The present research work focuses on the study of resistance and permittivity of Ni0.4Zn0.6Fe2O4 spinel ferrite compound in a wide temperature range. The equivalent electrical circuit of the sample is determined using impedance spectroscopy, revealing two relaxation times depending on frequency and temperature. The variation of ac conductivity and the giant resistance evolution are described and interpreted. The compound shows a high permittivity suitable for super capacitors and insulator layers in electronic devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Kiran Naz, Junaid Kareem Khan, Muhammad Khalid, Muhammad Saeed Akhtar, Zaheer Abbas Gilani, H. M. Noor ul Huda Khan Asghar, Gaber A. M. Mersal, Mohamed M. Ibrahim, A. Muhammad, M. G. B. Ashiq
Summary: A series of nickel substituted copper spinel ferrite nanoparticles were fabricated using sol-gel auto-combustion technique. The structural properties of the compound were determined through X-ray diffraction analysis. The dielectric properties of the synthesized nanomaterials were observed to vary with the nickel concentration, suggesting their potential application in microwave devices.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)