Article
Chemistry, Multidisciplinary
V. Dolezal, V. Jakes, J. Petrasek, P. Ctibor, O. Jankovsky, K. Rubesova, D. Sedmidubsky
Summary: The perovskite-type phase CaCu3Ti4O12 has promising dielectric properties, but the phenomenon of giant permittivity in this material has not been fully explained. In this study, Europium with similar electronegativity and ionic radius as Calcium was tested as a partial or complete substitute. A series of materials, including CaCu3Ti4O12, Eu0.4Ca0.6Cu3Ti4O12, and EuCu3Ti4O12, were prepared using a sol-gel method and sintering. The influence of microstructure and phase composition on the dielectric properties of the samples, as well as the effect of sintering temperature, was investigated. Secondary phases and microstructure were found to play a significant role in improving the permittivity values, which were found to be giant at higher frequencies but significantly different for specific compositions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Physical
V Poojitha, S. Mahalakshmi, K. Santhi, S. Nithyanatham
Summary: In this study, multiferroic bismuth ferrite was prepared using the sol-gel method and its structural and optical characteristics were examined. X-ray diffraction and Fourier transform infrared analysis were used to study the structure, while field emission scanning electron microscopy was used to observe the morphology. The research found that bismuth ferrite has potential importance in applications such as high dielectric constant capacitors and hard disc components.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Physical
Joshua P. Smith, Kurt E. Sickafus, Claudia J. Rawn, Cordell Delzer, Ching-Fong Chen, Charles Melcher
Summary: Li-containing garnet compounds have potential as transparent ceramic dual-mode scintillators, with Li5La3Ta2O12 showing promise due to its properties. This study focused on establishing thermal processing conditions for a sol-gel method and consolidating powders to form high-density ceramics. The experiments showed the presence of two cubic Li5La3Ta2O12 garnet phases with different lattice parameters, indicating a remaining excess of Li in the ceramics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Shubhadip Atta, Monalisa Halder, Vikram Bharti, Ajit Kumar Meikap
Summary: This study reports on the influence of terbium-doped nickel ferrite particles on the dielectric and magnetic properties of polymeric nanocomposites. The findings show that adding a certain filler content (x = 0.3) significantly improves the permittivity of the polyvinylidene fluoride matrix. High filler loading decreases the blocking temperature and promotes hard ferrimagnetic characteristics. The low-temperature regions exhibit higher saturation magnetization, retentivity, coercivity, and wider hysteresis loop area. The lightweight Tb-NFO-PVDF nanocomposite film offers superior advantages for electromagnetic shielding applications.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Syed Zia Hussain Hashmi, Muhammad Khalid, Ghulam Mustafa, Muhammad Gul Bahar Ashiq, Muhammad Younas, Ahsan Quddus, Hisham S. M. Abd-Rabboh, Thamraa Alshahrani, Kiran Naz, M. Mohamed Javid
Summary: The Solution-gelation self-ignition method was used to synthesize Nickel-doped Magnesium ferrite (MgFe2O4) nanoparticles with tunable dielectric and magnetic properties. The effect of nickel on crystal structure, crystallite size, dielectric properties, and magnetic properties was investigated. Various characterization techniques were employed, including XRD, FTIR, TEM, and VSM, to analyze the structure, size, and properties of the synthesized nanoparticles. The dielectric studies suggested potential applications of the Mg1-xNix-Fe2O4 nanoparticles in microwave devices.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Khalid Mujasam Batoo, Ritesh Verma, Ankush Chauhan, Rajesh Kumar, Muhammad Hadi, Omar M. Aldossary, Y. Al-Douri
Summary: This study reported the synthesis of Gd and Nb co-doped BT ceramic oxides and investigated their structural and electrical properties. Various analysis techniques were used to characterize the samples, revealing the influence of Gd and Nb doping on the electrical properties of the ceramic materials, which were found to improve with increasing dopant concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Amit Kumar, Piyush K. Patel, K. L. Yadav, Yogendra Singh, Naveen Kumar, Abdullah, G. Sharma, Satyendra Singh
Summary: The effect of grain boundary resistance (G(BR)) and grain resistance (G(R)) on the magnetoelectric coupling in multiferroic composite thick films of BiFeO3 (BFO) nanocrystalline powder and poly vinylidene-fluoride (PVDF) polymer is significant. The study shows that grain boundary resistance plays an important role in strengthening the magnetoelectric effect in the BFO-PVDF system, with the BFO50 sample demonstrating promising results for device and sensor applications.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Materials Science, Multidisciplinary
K. Iben Nassar, N. Rammeh, S. Soreto Teixeira, M. P. F. Graca
Summary: This study investigates the effects of substituting La with Pr on the electrical and magnetic properties of the compound La2-xPrxNiMnO6. The results show that Pr doping leads to a decrease in dielectric constant and the presence of relaxation phenomenon. Moreover, the electrical conductivity follows the Arrhenius law, and the Curie temperature decreases with increasing Pr content.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shubhadip Atta, Monalisa Halder, Santanu Dey, Chandan Kumar Raul, Ajit Kumar Meikap
Summary: This study reports the dielectric and magnetocaloric effects in flexible Neodymium-doped nickel ferrite polyvinyl-alcohol nanocomposite films. The composite exhibits enhanced dielectric permittivity at a specific filler concentration, while the magnetic entropy change decreases with higher doping in the polymer chain. The magnetodielectric coefficient is enhanced at higher frequencies and with increased doping concentration. Additionally, the observed skin depth of the polymer nanocomposite is lower than the film's thickness, making it suitable for electromagnetic shielding.
CURRENT APPLIED PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Najah Rhimi, N. Dhahri, M. Khelifi, E. K. Hlil, J. Dhahri
Summary: This work focuses on studying the properties of sodium bismuth titanate (NBT) ceramic, including its structure, optical properties, and electrical properties. The material exhibited a poly-crystalline structure with a rhombohedral shape, and a grain size of 29.17 μm. The dielectric loss and dielectric constant increased with frequency, and the conduction mechanism followed the correlated barrier hopping (CBH) and small polaron hopping (SPH) models. The study provides valuable insights into the physical characteristics of NBT and its potential applications in the industry.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
S. Baul, T. C. Paul, K. Hoque, M. N. I. Khan, S. Islam, S. K. Sen, M. M. Kamal, P. Bala
Summary: NiFe2O4 nanoparticles supported with different wt% of DDA-MMT were successfully synthesized by sol-gel autocombustion method. The addition of DDA-MMT was found to influence the crystallite size, saturation magnetization, dielectric constant, and optical band gap of NiFe2O4. This study suggests that the physical properties of Ni ferrite can be modified by adding the right quantity of DDA-MMT as a supporting material, thereby expanding its potential applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Physics, Condensed Matter
Muhammad Zain Yar, Muhammad Khalid, Muhammad Yasin, Kiran Naz, Muhammad Gul Bahar Ashiq, Muhammad Younas, Thamraa Alshahrani, Khaild I. Hussein, Khizar Bin Hassan, Bilal Ahmed, M. Mohamed Javid
Summary: The manganese-substituted nickel-rich lithium-cobalt oxide Li2Ni6MnxCo2-xO10 was successfully synthesized using the sol-gel autocombustion method. The structure and morphology of the material were characterized by XRD and SEM techniques, respectively. The prepared nanomaterial exhibited a hexagonal structure with a secondary phase. The average crystallite size was determined to be between 12 and 27 nm using different methods. SEM analysis showed the surface morphology and particle size distribution. The dielectric characteristics of the material were frequency-dependent, indicating suitability for high-frequency devices. Magnetic measurements revealed variations in saturation magnetization and coercivity with increasing Mn concentration. The obtained dielectric properties suggest potential applications in energy storage.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Ceramics
Zheng Sun, Wenxu Liu, Qiuyang Li, Zhi Tao, Yemei Han
Summary: Introducing Bi(Zn2/3Nb1/3)O-3 successfully improved the dielectric performance of (1-x) BZT20-xBZN composite ceramics, with sample 0.94BZT20-0.06BZN exhibiting enhanced dielectric constants and a higher degree of relaxor behavior (γ=1.91).
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Ghulam Mustafa, Muhammad Khalid, Ali Dad Chandio, Kiran Shahzadi, Zaheer Uddin, Junaid Kareem Khan, Naimat Ullah Channa, Zaheer Abbas Gilani, H. M. Noor ul Huda Khan Asghar
Summary: A series of lanthanum-doped nickel ferrites were synthesized and their dielectric properties were studied. The results showed that the La doping induced lattice strain and affected the lattice constant, resulting in changes in dielectric loss and dielectric constant. The materials exhibited the most stable dielectric properties at high frequencies, making them potential candidates for microwave devices.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jamshed Ahmad, Muhammad Khalid, Ghulam Mustafa, Abeer A. AlObaid, Tahani Al-Muhimeed, Muhammad Saeed Akhtar, Arif Akhtar Azam, Ghazanfar Nazir, Hisham S. M. Abd-Rabboh
Summary: In this study, single phase Bismuth Iron Oxide (BFO) nanoparticles were successfully synthesized using the Sol-Gel method, and the effect of calcinating temperature on their crystallinity was investigated. The improvement in crystallinity was demonstrated by the growth of crystallites and the analysis of grain size using SEM and XRD. The dielectric constant of the nanoparticles was determined, showing a minimum value at higher frequency, and the temperature and frequency dependent properties were also studied. The results suggest the potential applications of the prepared BFO nanoparticles in advanced magneto and ferroelectric devices.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Materials Science, Ceramics
Nadejda Horchidan, Leontin Padurariu, Cristina E. Ciomaga, Lavinia Curecheriu, Mirela Airimioaei, Florica Doroftei, Florin Tufescu, Liliana Mitoseriu
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2020)
Article
Chemistry, Physical
Lavinia Curecheriu, Vlad Alexandru Lukacs, Leontin Padurariu, George Stoian, Cristina Elena Ciomaga
Article
Polymer Science
Elisabetta Brunengo, Lucia Conzatti, Ilaria Schizzi, Maria Teresa Buscaglia, Giovanna Canu, Lavinia Curecheriu, Chiara Costa, Maila Castellano, Liliana Mitoseriu, Paola Stagnaro, Vincenzo Buscaglia
Summary: Composites of PVDF and BaTiO3 nanoparticles fabricated through melt blending and compression molding exhibit improved dielectric properties, with increased permittivity and lower dielectric losses. Processing parameters play a key role in optimizing material performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Acoustics
Nadejda Horchidan, Lavinia Curecheriu, Cristina E. Ciomaga, Nicoleta Lupu, Liliana Mitoseriu
Summary: In the x BaGeO3-(1 - x)BaTiO3 ceramics, with Ge content below 0.10, the materials exhibit similar dielectric properties to BaTiO3 ceramics. However, increasing Ge content can enhance relative density and grain size, improving electrical properties, but may lead to loss of switching characteristics.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2021)
Article
Polymer Science
Carmen Racles, Mihai Asandulesa, Vasile Tiron, Codrin Tugui, Nicoleta Vornicu, Bianca-Iulia Ciubotaru, Matej Micusik, Maria Omastova, Ana-Lavinia Vasiliu, Cristina Ciomaga
Summary: PDMS-based soft elastic composites containing polysulfone-supported silver nanoparticles (Ag@PSF) were synthesized and investigated for their tunable mechanical properties, electrical actuation behavior, antibacterial/antifungal activity, low bioadhesion, and piezoelectricity. The composites showed a synergistic effect of the fillers' components, making them potential candidates for applications in biomedical field such as actuators, sensors, or micro/nanogenerators.
Article
Materials Science, Ceramics
Cristina Elena Ciomaga, Nadejda Horchidan, Leontin Padurariu, Radu Stefan Stirbu, Vasile Tiron, Florin Mihai Tufescu, Ionut Topala, Oana Condurache, Mihaela Botea, Ioana Pintilie, Lucian Pintilie, Aurelian Rotaru, Gabriel Caruntu, Liliana Mitoseriu
Summary: Flexible composites containing BaTiO3 nanoparticles into Gelatin bio-polymer matrix were designed and investigated. The experimental results showed that the addition of high-permittivity nanofillers significantly increased the permittivity and piezoelectric coefficient of the composites. The simulations also demonstrated that the composite with embedded BaTiO3 nanoparticles exhibited a better mechanical harvesting response.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
V. A. Lukacs, M. Airimioaei, L. Padurariu, L. P. Curecheriu, C. E. Ciomaga, A. Bencan, G. Drazic, M. Avakian, J. L. Jones, G. Stoian, M. Deluca, R. Brunner, A. Rotaru, L. Mitoseriu
Summary: The functional properties of BaTiO3 ceramics with different grain sizes (ranging from 75 nm to 2.25 μm) and polymorph coexistence around room temperature are studied. The research finds that there is a large temperature range of phase coexistence, but the extension of the coexistence domain does not show a significant size effect. However, the transition temperatures vary with grain size. The permittivity values of these ceramics are among the highest reported, with the typical maximum around 1 μm grain size.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Nadejda Horchidan, Cristina Elena Ciomaga, Lavinia Petronela Curecheriu, George Stoian, Mihaela Botea, Mihaela Florea, Valentin Adrian Maraloiu, Lucian Pintilie, Florin Mihai Tufescu, Vasile Tiron, Aurelian Rotaru, Liliana Mitoseriu
Summary: The role of Ag addition in the structural, dielectric, and mechanical harvesting response of flexible composites is investigated. The presence of filler enhances the permittivity, and the addition of Ag further increases the permittivity. The metallic addition is also beneficial for the mechanical harvesting ability of the composites.
Article
Chemistry, Physical
Radu Stefan Stirbu, Leontin Padurariu, Fereshteh Falah Chamasemani, Roland Brunner, Liliana Mitoseriu
Summary: This paper investigates the microstructure features of soft additives used for producing porous ceramics and the formation mechanism of their anisotropic properties. It is found that equiaxed soft polymeric additives can result in anisotropic porosity in ceramics due to the deformation during the pressing step. Analytical and numerical calculations show that uniaxial pressing of solid particles with contrasting mechanical properties generates modifications in the shape of the soft phase, leading to anisotropic shape distribution of the soft inclusions in the green ceramic body and elongated porosity in the final ceramic product.
Article
Nanoscience & Nanotechnology
Leontin Padurariu, Nadejda Horchidan, Cristina Elena Ciomaga, Lavinia Petronela Curecheriu, Vlad Alexandru Lukacs, Radu Stefan Stirbu, George Stoian, Mihaela Botea, Mihaela Florea, Valentin Adrian Maraloiu, Lucian Pintilie, Aurelian Rotaru, Liliana Mitoseriu
Summary: This paper investigates the effect of ferroelectric filler size and clustering on the dielectric properties of 20%BaTiO3-80%PVDF and 20%(2%Ag-98%BaTiO3)-PVDF hybrid nanocomposites. Finite element calculations reveal that fillers with epsilon > 103 do not enhance the permittivity in the composites, and the effective dielectric constant saturates to specific values determined by filler size and clustering. Addition of metallic ultrafine nanoparticles (Ag) increases the permittivity, especially when they are well connected to the ferroelectric particles' surfaces. Experimental dielectric analysis confirms the trends predicted by simulations, with slightly higher permittivity values likely due to changes in polymer phase composition and local inhomogeneity caused by nanofillers and clustering.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Lavinia Curecheriu, Maria Teresa Buscaglia, Vlad Alexandru Lukacs, Leontin Padurariu, Cristina Elena Ciomaga
Summary: The dielectric and electrocaloric properties of Ba0.90Ca0.10TiO3 ceramics were investigated, and the influence of density and grain size on these properties was discussed. The ceramics exhibited good dielectric properties and significant electrocaloric effects. Ba0.90Ca0.10TiO3 ceramics with a density larger than 90% and grain sizes of a few micrometers are suitable materials for electrocaloric devices.
Article
Chemistry, Physical
Nicolae Apostolescu, Ramona Elena Tataru Farmus, Maria Harja, Mihaela Aurelia Vizitiu, Corina Cernatescu, Claudia Cobzaru, Gabriela Antoaneta Apostolescu
Summary: CeO2/ZnO-based photocatalytic materials were synthesized by the sol-gel method to establish heterojunctions and enhance the degradation efficiency of certain antibiotics. The optimal catalyst concentration for chlortetracycline was determined to be 0.05 g/L, while for ceftriaxone it was 0.05 g/L. CeO2/ZnO assemblies showed superior degradation efficiency compared to individual ZnO or CeO2. Sample S3 demonstrated good photocatalytic properties for the elimination of ceftriaxone and tetracycline in both single and binary solutions. This study offers new insights into the identification of potent and cost-effective photocatalysts for wastewater treatment.
Article
Chemistry, Physical
Cristina Elena Ciomaga, Lavinia P. P. Curecheriu, Vlad Alexandru Lukacs, Nadejda Horchidan, Florica Doroftei, Renaud Valois, Megane Lheureux, Marie Helene Chambrier, Liliana Mitoseriu
Summary: Lead-free piezoelectric ceramics with nominal composition at morphotropic phase boundary Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCTZ) were prepared by different processing routes and sintered using different techniques. The study showed that the ceramics exhibited diffuse phase transition and ferroelectric switching responses, with the electrocaloric and piezoelectric effects being influenced by the density and poling efficiency.
Article
Materials Science, Multidisciplinary
Radu Stefan Stirbu, Liliana Mitoseriu
Summary: The hysteretic character of the electromechanic coupling in porous piezoeceramics was investigated using modeling and analysis to determine the relationships between polarization, strain, and porosity. The study calculated the local electrical and mechanical responses and determined effective dielectric and piezoelectric constants. The results showed a nonlinear decrease in polarization and deformation with porosity and discussed the effects of different polarization states on the effective permittivity and piezoelectric constants.
COMPUTATIONAL MATERIALS SCIENCE
(2024)
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)