Article
Environmental Sciences
Umesh Chejara, Anamika Prajapati, Arvind Kumar
Summary: This study synthesized and characterized nano-particles of polycrystalline magnesium and iron ferrite doped with rare earth materials. The electrical properties of these materials were measured, and it was found that they exhibit variation behavior with respect to frequency. The study suggests that these materials may have potential applications in the fabrication of microwave antennas to reduce energy losses.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Charanjeet Singh, Maria Vesna Nikolic, Sukhleen Bindra Narang, Antonio Sergio Bezerra Sombra, Di Zhou, Sergei Trukhanov, Larrisa Panina, Jasbir Singh, Alex Trukhanov
Summary: This study focuses on the preparation and microwave characterization of composites of M-type hexagonal ferrite with paraffin wax. The influence of Sr2+ ion content on material parameters, including grain morphology, dielectric, magnetic, conductivity, and reflection loss properties, was analyzed. The results indicate that higher Sr2+ ion content leads to lower dielectric and magnetic loss tangent, as well as increased AC conductivity with frequency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
Ali B. Abou Hammad, A. M. Mansour, Amany M. El Nahrawy
Summary: Nano-structure ferromagnetic-ferroelectric composite materials prepared by the sol-gel method, such as Potassium Barium titanate doped with Ni2+ nanoparticles, exhibit enhanced thermal stability and optical bandgap. The incorporation of Ni2+ nanoparticles can alter the structural and band structures interactions, leading to efficient charge carrier transfer.
Article
Materials Science, Multidisciplinary
K. Samatha, Raghavendra Sagar
Summary: Substituted Co3O4 spinels in the form of NiCo2O4 and ZnCo2O4 were prepared using a wet chemical co-precipitation approach at 500 degrees C. The average grain size of the spinels was estimated to be typically below 200 nm. The microstructure analysis showed that Ni and Zn substituents effectively facilitated grain growth for Co3O4 spinel. Fourier transform infrared spectra confirmed the formation of pure phases. The electrical and dielectric properties of the substituted Co3O4 spinels were studied at different temperatures and frequencies, revealing a decrease in relative permittivity with increasing frequency and consistent ac-conductivity at all frequencies.
BULLETIN OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Hafedh Belmabrouk, Mohammed A. Albedah, Rahma Ayed Brahem, Safwen Elkossi, Anouar Jbeli, Marwa Selmi
Summary: This paper investigates a new ceramic material with a BaTiO3-like structure, focusing on its synthesis, structure, and dielectric characteristics. The material was synthesized using the solid-state method and was found to have a cubic structure with the space group Pm-3m, as confirmed by X-ray diffraction analysis. The sample's crystalline and grain size were estimated to be approximately 147 nm and 1.43 μm, respectively, using Debye Scherrer's formula and SEM. The electrical conductivity data (AC) adhered well to Jonscher's power law, specifically the barrier hopping model (CBH). The DC conductivity revealed thermally activated conduction and semiconductor behavior. As the frequency increased, the dielectric permittivity (ε) decreased, which can be explained by Maxwell-Wagner's theory of interfacial polarization. Complex impedance spectra indicated the presence of a non-Debye relaxation phenomenon. Electrical modulus measurements revealed a thermally activated relaxation attributed to the Maxwell-Wagner (M-W) space charge relaxation phenomenon, with an activation energy (Ea) of approximately 0.623 eV.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Abdul Hakeem, Thamraa Alshahrani, Irshad Ali, M. H. Alhossainy, Rabia Yasmin Khosa, Ghulam Muhammad, Abdul Rauf Khan, Hafiz Muhammad Tahir Farid
Summary: This study described the synthesis and assessment of ferrite polymer composites with different properties, prepared by mixing ferrite nanoparticles and polypyrrole. The samples were analyzed for surface morphology, structural properties, and magnetic properties, with results suggesting that samples with 25% and 50% ferrite content may be suitable for hyperthermia applications.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Physics, Condensed Matter
B. Trinadh, J. Suresh, G. R. Patta, K. Vijaya Babu, Ch Komali, B. Vikram Babu, K. Anjani Devi, B. Sathish Mohan, K. Samatha
Summary: In this study, Co0.7Cu0.2Zn0.1Fe2-xAlxO4 nano-ferrites were synthesized using sol-gel auto-combustion process, and their structural, optical, electrical and magnetic properties were systematically characterized. The results showed that these nano-ferrites exhibit strong electrical and magnetic properties as well as structural stability.
SOLID STATE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Omar Rejaiba, Fakher Hcini, Maria Nasri, Bandar Alzahrani, Mohamed Lamjed Bouazizi, E. K. Hlil, Jabeur Khelifi, Kamel Khirouni, Essebti Dhahri
Summary: The CuFeCr0.5Ni0.5O4 (CFO) compound was successfully synthesized using sol-gel reaction combustion technic, and the study revealed a non-Debye type relaxation phenomenon in the sample, leading to complex electrical transport properties.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
O. Gurbuz, M. Okutan, P. Haring Bolivar
Summary: The electron beam deposition technique was used to accumulate FeGe alloys on Si substrates, and the crystal and phase dependence of FeGe alloys were analyzed using XRD technique. The size of the crystalline increased from 44.8 to 51.8nm depending on the concentration of increasing Ge, as calculated using Scherrer's method. The morphology and grain size changes of the alloys were compared with SEM in terms of their surface distribution. The dielectric properties, tangent loss, and AC conductivity (sigma(ac)) were demonstrated depending on the frequency.
Article
Engineering, Chemical
Xicheng Gao, Jianqiang Bi, Linjie Meng, Lulin Xie, Chen Liu
Summary: A two-step method was used to prepare oxygen vacancies engineered NiFe2O4, which exhibited better conductivity and electrochemical performance. This work provides an effective way to improve the application of metal oxides in supercapacitors.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Laxmikant Banaj, Sadhana Agrawal
Summary: A series of Zr4+ doped MgFe2O4 samples were synthesized using the solid-state reaction method. The samples showed a single phase cubic spinel structure with irregular grain morphology. The electrical properties were investigated through dielectric constant and loss analysis, complex impedance spectroscopy, and AC conductivity calculation.
CURRENT APPLIED PHYSICS
(2023)
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, Ceramics
B. N. Ramakrishna, Apsar Pasha, Syed Khasim, S. O. Manjunatha
Summary: In this study, a cost-effective synthesis of lanthanum doped cobalt-iron ferrite composite sensors for the detection of liquefied petroleum gas (LPG) at room temperature is reported. The synthesized ferrite composites showed improved electrical conductivity and gas sensing properties, making them suitable for the detection of low concentration LPG.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Sani Kundu, Toton Sarkar, Ashis Bhattacharjee
Summary: Hematite nanomaterials were synthesized by thermal decomposition of different precursors, and the dielectric properties and conduction mechanisms were studied. The hematite nanomaterials exhibited particle-size-dependent high dielectric constant, highlighting their potential for applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
S. T. Assar, E. H. El-Ghazzawy, H. F. Abosheiasha
Summary: The dielectric properties of Ni1-xCaxFe2O4 nanoparticles were investigated at different temperatures and frequencies. The results showed that the frequency dispersion of the samples was attributed to the interfacial polarization mechanism, and the variation of the ac conduction depended on the hopping of electrons and holes between ions. In addition, the electrical properties of the samples were influenced by the grain and grain boundary effects. The samples exhibited suitable electrical properties for use as inductor-cores in high-frequency power transformers for telecommunication purposes.
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)