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
Materials Science, Ceramics
C. Murugesan, K. Ugendar, L. Okrasa, Jun Shen, G. Chandrasekaran
Summary: In this study, nanocrystalline Mn-Zn ferrites were synthesized through a solvent-free combustion reaction method and characterized using various techniques. The results showed that Zn substitution affects the crystallite size and electrical properties of the samples, but does not significantly alter the ionic states. The Zn-substituted manganese ferrite nanoparticles hold promise for high-frequency electronic device applications.
CERAMICS INTERNATIONAL
(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
Materials Science, Ceramics
Pu Mao, Jiping Wang, Peng Xiao, Lixue Zhang, Fang Kang, Hao Gong
Summary: This study developed a novel system of isovalent Zr4+ and donor Nb5+ co-doped CaCu3Ti4O12 (CCTO) ceramics to enhance dielectric response. The co-doping of Zr4+ and Nb5+ ions significantly reduced grain size and improved dielectric constant, leading to giant dielectric response within broader frequency and temperature ranges. The enhanced dielectric response is primarily attributed to the complex defect dipoles associated with oxygen vacancies by co-doping Zr4+ and Nb5+ ions into CCTO structure.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
P. Annie Vinosha, A. Manikandan, R. Ragu, A. Dinesh, K. Thanrasu, Y. Slimani, A. Baykal, Belina Xavier
Summary: The physical properties of nickel substituted cobalt ferrite nanocrystals were investigated in this study, including structural, electrical, magneto-optical, and thermal properties. Various techniques such as XRD, FT-IR, VSM, UV-visible spectra, LCR meter, and photoacoustic spectrophotometer were used for characterization. Increasing nickel substitution led to a decrease in crystallite size and an increase in surface analysis of the synthesized products, making them suitable for high-frequency electromagnetic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Suman Pawaria, Jyoti Ahlawat, Sajjan Dahiya, Anil Ohlan, R. Punia, S. Murugavel, A. S. Maan
Summary: This study investigated the conductivity spectra of (80-x)B2O3.20ZnO.xLi(2)O (x = 10, 20, 30, and 40) glass series and found that the Overlapping Large Polaron Tunneling mechanism is applicable in these glasses. The activation energy values obtained from different analyses were in good agreement. The glass composition with the highest conductivity was identified for potential use in energy storage devices.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
M. Nasri, C. Henchiri, R. Dhahri, J. Khelifi, H. Rahmouni, E. Dhahri, L. H. Omari, A. Tozri, Mohamed R. Berber
Summary: The study focuses on synthesizing materials for high frequency applications that are useful and cost-effective. Using the sol-gel method, Cu-substituted CoFe2O4 was elaborated with a confirmed single-phase cubic spinel structure. The material showed potential for high frequency applications due to its low dielectric loss and increased ac conductivity, indicating a semiconductor character and significant gain in productivity.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
C. Murugesan, L. Okrasa, K. Ugendar, G. Chandrasekaran, Xiaodi Liu, Dongfeng Diao, Jun Shen
Summary: The study investigates the structural, magnetic, and electrical properties of Mg1-xZnxFe2O4 nanoferrites synthesized using a solvent-free combustion route. The results show that the prepared samples have single-phase nature, and the size of the crystallites and the position of the vibrational modes vary with Zn. The magnetization is enhanced up to a certain point and then decreases, while the conductivity decreases gradually after a certain value.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
M. Z. Ahsan, M. M. Kamal, S. S. Rakhi, S. N. Tanha, G. I. Hasan
Summary: This communication reports the electric modulus of manganese doped cobalt ferrite nanoparticles. The characteristic frequency of the dispersion of the imaginary portion of the electric modulus does not follow the rising trend in Mn content due to the heterogeneity in microstructure. The Nyquist plot of the complex electric modulus identifies the dominant charge carriers in the conduction phase based on the Mn content.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
A. Saidi, A. Mabrouki, J. Dhahri, E. Dhahri, K. Khirouni, B. F. O. Costa
Summary: In this study, the perovskite compound Ba0.70Er0.16Ca0.05Ti0.91Sn0.09O3 (BECTSO) was synthesized via solid-state reaction and sintering. The effects of doping on the structural, electrical, dielectric, and ferroelectric characteristics of BECTSO were examined. The results showed high dielectric constant, phase transition at T-c = 360 K, and different conductivity behaviors.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Condensed Matter
Sikha Sarmah, Ritupan Borah, P. K. Maji, S. Ravi, Tribedi Bora
Summary: The structural, magnetic, and dielectric properties of Co(Fe1-xAlx)(2)O-4 (x = 0, 0.02, 0.05, 0.15, and 0.20) synthesized by sol-gel method and sintered at 1100 ?C have been investigated. The results show that Al3+ substitution decreases the saturation magnetization, except for the x = 0.02 sample, which exhibits an enhanced saturation magnetization due to cationic re-distribution. The coercive field is mainly influenced by magnetocrystalline anisotropy. The dielectric constant decreases with Al3+ substitution, but shows a sharp increase around 1 MHz for the x = 0.20 sample. The ac conductivity study reveals that the conduction mechanism deviates from Jonschers' Power law above 383 K, as observed in most spinel ferrites.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Sanjeet Kumar Paswan, Pawan Kumar, Suman Kumari, Subhadeep Datta, Manoranjan Kar, J. P. Borah, Lawrence Kumar
Summary: This study investigates the structural, optical, temperature-dependent magnetic, and electrical properties of nanocrystalline NiFe1.97RE0.03O4 (RE = La3+ and Sm3+) compound. The results show that rare earth ion substitution leads to a decrease in lattice constant and particle size. The optical and magnetic properties of rare earth substituted samples are different from pure nickel ferrite, while their electrical properties exhibit similar behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Engineering, Electrical & Electronic
Buddhadev Samanta, P. Kumar, Dipika Nanda
Summary: In this study, polycrystalline CaCu3Ti4-xAlxO12 ceramics were synthesized using microwave-assisted solid-state reaction. It was found that Al substitution at Ti sites and the presence of a moderate amount of CuO intergranular melt-like phase can improve the dielectric properties of the ceramics. The effects of Al3+ substitution and CuO phase on the dielectric and impedance properties were investigated, and an elementary theoretical framework was proposed to understand the improved dielectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Mohamed Amghar, Amira Bougoffa, Abdessalem Trabelsi, Abderrazek Oueslati, Essebti Dhahri
Summary: This study synthesized two compounds, AgxZn1-xAl2O4-x/2 (x=0.05 and x=0.1), and confirmed their spinet structure. The compounds exhibited band gaps of 4.3 eV and 4 eV for x=0.05 and x=0.1, respectively, indicating their potential for optoelectronics. The dielectric parameters were also investigated, revealing the activation energies to be approximately 0.659 eV and 0.41 eV for x=0.05 and x=0.1, respectively.
Article
Materials Science, Multidisciplinary
Muhammad Mubashar Munir, Ali Raza Khan, Ghulam M. Mustafa, S. Kumail Abbas, M. Akram Raza, Shahid Atiq, Shahzad Naseem
Summary: The presence of multiferroic behavior in materials plays a crucial role in technological advancements, with the combination of dielectric and magnetic orders in a single device becoming a fascinating topic for material scientists. The synthesis of Zn-substituted NiCo2O4 using sol-gel auto-combustion technique confirmed its spinel-based cubic structure, with Zn substitution leading to an increase in grain size. Additionally, Koop's theory and the Maxwell-Wagner model explained the decrease in dielectric constant with frequency enhancement.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Ceramics
Abdessalem Dhahri, Faten Ibn Elhaj Rhouma, Mohamed Ali Zaidi, Mohamed Abou-Elsoud
CERAMICS INTERNATIONAL
(2015)
Article
Chemistry, Physical
Faycal Bourguiba, Ah Dhahri, F. I. H. Rhouma, S. Mnefgui, J. Dhahri, K. Taibi, E. K. Hlil
JOURNAL OF ALLOYS AND COMPOUNDS
(2016)
Article
Chemistry, Physical
Afef Ben Hassen, F. I. H. Rhouma, J. Dhahri, N. Abdelmoula
JOURNAL OF ALLOYS AND COMPOUNDS
(2016)
Article
Chemistry, Physical
Afef Ben Hassen, F. I. H. Rhouma, J. Dhahri, N. Abdelmoula, K. Taibi, Hafedh Belmabrouk, M. Zaidi
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Optics
F. Belkhiria, F. I. H. Rhouma, S. Hcini, M. Daoudi, H. Gammoudi, M. Amlouk, R. Chtourou
JOURNAL OF LUMINESCENCE
(2017)
Article
Materials Science, Multidisciplinary
F. I. H. Rhouma, A. Dhahri, J. Dhahri, M. A. Valente, K. Khirouni
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2014)
Article
Materials Science, Ceramics
A. Dhahri, F. I. H. Rhouma, S. Mnefgui, J. Dhahri, E. K. Hlil
CERAMICS INTERNATIONAL
(2014)
Article
Physics, Condensed Matter
S. El Kossi, F. I. H. Rhouma, J. Dhahri, K. Khirouni
PHYSICA B-CONDENSED MATTER
(2014)
Article
Chemistry, Multidisciplinary
F. I. H. Rhouma, F. Belkhiria, E. Bouzaiene, M. Daoudi, K. Taibi, J. Dhahri, R. Chtourou
Article
Materials Science, Multidisciplinary
Amal Elhamza, F. I. H. Rhouma, J. Dhahri, E. K. Hlil
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2017)
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)