A5021338914- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Copper-based nanomaterials and applications
- Metallurgical Processes and Thermodynamics
- Magnetic properties of thin films
- Magnetic Properties and Synthesis of Ferrites
- Iron and Steelmaking Processes
- Physics of Superconductivity and Magnetism
- Iron oxide chemistry and applications
- Metal Extraction and Bioleaching
- Electronic and Structural Properties of Oxides
- Superconductivity in MgB2 and Alloys
- Gas Sensing Nanomaterials and Sensors
- Multiferroics and related materials
- Quantum and electron transport phenomena
- Electrocatalysts for Energy Conversion
- Advanced Condensed Matter Physics
- Minerals Flotation and Separation Techniques
- Magnetic Properties and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Memory and Neural Computing
- Non-Destructive Testing Techniques
- TiO2 Photocatalysis and Solar Cells
- Metallurgy and Material Science
- Aluminum Alloy Microstructure Properties
Universidade Estadual de Maringá
2018-2024
Universidade Federal de São Carlos
2021-2024
National University of San Marcos
2021-2023
Centro Brasileiro de Pesquisas Físicas
2020
Abstract Tons of waste is produced during iron steel’s industrial production, creating environmental pollution. This work aims to characterize the steel scale formed on billet surface last step production in SIDERPERU plant. Scanning Electron Microscopy (SEM) shows stacked layers one above other billets scales surface. Energy Dispersive X-ray (EDX) and Fluorescence (XRF) reveal high content Fe O, with Ca, Si, Mn, Cr as minority elemental compounds. Diffraction (XRD) FeO, α-Fe 2 O 3 4...
Abstract A billet is a bar made from crude steel which surface contains scales are rich in iron oxides. This study presents the carbothermal reduction of formed billets. The process included reaction oxides contents with carbon (in ratio 5:1) and annealing tubular furnace under argon atmosphere. occurred reactions discussed using thermodynamic calculations thermal analysis indicate three-stage Fe 3 O 4 ➔ FeO C ➔α-Fe intermediate at interval temperature 960 1300 °C. X-ray diffraction confirms...
Granularity is one of the main features restricting maximum current which a superconductor can carry without losses, persisting as an important research topic when applications are concerned. To directly observe its effects on typical thin superconducting specimen, we have modeled simplest possible granular system by fabricating single artificial weak-link in center high-quality Nb film using focused ion beam technique. Then, microstructural, magnetic, and electric properties both normal...
Minor loops of solubilized and aged samples maraging-400 steel were measured mathematically analyzed. The descending ascending parts the hysteresis curves obtained for this soft ferromagnetic material fit with polynomials varying degree. fits successful polynomial coefficients revealed that a symmetry operation (S2) transforms part into (or vice versa). Based on particular mathematical relation between polynomials, an analytical expression minor loop area was as function specific maximum...
Cu1−xFexO nanoparticles were prepared using a freeze-drying process followed by heat treatment. The particles then characterized Mössbauer spectroscopy and magnetization techniques. results revealed complex magnetic behavior, which can be attributed to the presence of two different regions: particle core, has antiferromagnetic fluctuations, shell, where uncompensated spins are responsible for their superparamagnetic characteristics. At low temperatures, moments freeze, revealing...
Abstract The primary process in an electrical arc furnace (EAF) during industrial steelmaking results tons of black slags which cause pollution to the environment. In this work, iron oxides generated EAF from SIDERPERU plant, Peru was reduced via carbothermal reaction. reduction slag α-Fe is demonstrated by X-ray diffraction, Mӧssbauer spectroscopy and magnetometry. However, phases with calcium silicon persist sample after process. thermodynamic calculations most probable reactions sequence...
Ni1−xFexO single phase nanoparticles, synthesized by lyophilization and heat treatment, were characterized microscopic spectroscopic techniques searching for evidence of a core-shell structure. Transmission electron microscopy, X-ray photoelectron spectroscopy, more extensively Mössbauer spectroscopy applied in this study. Consistent with structural magnetic analyses previously reported, these findings support the plausibility structure nanoparticles. The shell was found to be very thin...
Monophasic Zn1-xFexO nanoparticles with wurtzite structure were synthesized in the 0 ≤ x 0.05 concentration range using a freeze-drying process followed by heat treatment. The samples characterized regarding their optical, structural, and magnetic properties. analyses revealed that iron doping of ZnO matrix induces morphological changes crystallites. Iron is substitutional for zinc, trivalent distributed lattice two groups: isolated atoms one or more neighboring atoms. It was also shown...
Undoped and Fe-doped NiO nanoparticles were successfully synthesized using a lyophilization method systematically characterized through magnetization techniques over wide temperature range, with varying intensity frequency of the applied magnetic fields. The Ni1-xFexO can be described by core-shell model, which reveals that Fe doping enhances exchange interactions in correlation nanoparticle size reduction. exhibit superparamagnetic blocking transition, primarily attributed to their cores,...
Abstract The steel industry produces large amounts of slag coming from different stages during the steelmaking process every year. Currently, there are numerous attempts to recycle it or use in some other sectors and preserve environment. characteristics depends on is crucial have before any attempt recycling. In this work, sample produced ladle furnace SIDERPERU plant were collected analyzed by using energy dispersion X-ray (EDX), diffraction (XRD), fluorescence spectroscopy (XRF), SQUID...
Abstract Carbonatite is an igneous rock that composed mainly of carbonate minerals and silicates. It recently applied as fertilizer due to its high content calcite dolomite. This study presents a physical chemical characterization the Spanish River (SRC) application tested. The composition obtained by X-ray fluorescence Energy Dispersive analyses indicates Ca, Fe Si are main contained elements. Calcite SiO 2 principal mineralogical phases detected diffraction. Fourier transform infrared...
Undoped and Fe-doped NiO nanoparticles were successfully synthesized using a lyophilization method systematically characterized through magnetization techniques over wide temperature range, with varying intensity frequency of the applied magnetic fields. The Ni1-xFexO can be described by core-shell model, which reveals that Fe doping enhances exchange interactions in correlation nanoparticle size reduction. exhibit superparamagnetic blocking transition, primarily attributed to their cores,...
Ubiquitous in most superconducting materials and a common result of nanofabrication processes, weak-links are known for their limiting effects on the transport electric currents. Still, they at root key features technology. By performing quantitative magneto-optical imaging experiments thermomagnetic model simulations, we correlate existence local maxima magnetization loops FIB-patterned Nb films to magnetic field-induced weak-to-strong-link transformation increasing critical current. This...
Ubiquitous in most superconducting materials and a common result of nanofabrication processes, weak links are known for their limiting effects on the transport electric currents. Still, they at root key features technology. By performing quantitative magneto-optical imaging experiments thermomagnetic model simulations, we correlate existence local maxima magnetization loops focused ion beam (FIB)-patterned Nb films to magnetic field induced weak-to-strong-link transformation increasing...