A5072170613- Magnetic Properties and Synthesis of Ferrites
- Multiferroics and related materials
- Iron oxide chemistry and applications
- ZnO doping and properties
- Semiconductor materials and devices
- Advanced Nanomaterials in Catalysis
- Ferroelectric and Negative Capacitance Devices
- Microstructure and Mechanical Properties of Steels
- Graphene and Nanomaterials Applications
- Catalytic Processes in Materials Science
- Metal Alloys Wear and Properties
- Microwave-Assisted Synthesis and Applications
- Ga2O3 and related materials
- Microwave Dielectric Ceramics Synthesis
- Electronic and Structural Properties of Oxides
- Integrated Circuits and Semiconductor Failure Analysis
- Hydrogen embrittlement and corrosion behaviors in metals
- Copper-based nanomaterials and applications
- Magneto-Optical Properties and Applications
- Luminescence Properties of Advanced Materials
- Advancements in Semiconductor Devices and Circuit Design
- Transition Metal Oxide Nanomaterials
- Microstructure and mechanical properties
- Electron and X-Ray Spectroscopy Techniques
- Pigment Synthesis and Properties
Universidade Federal de Itajubá
2017-2023
Anhui University
2017
Universidade de Brasília
2007-2015
Co x Fe 3 − O 4 -based (x=0.05–1.6) nanoparticles prepared by combustion reaction were investigated using x-ray diffraction, Raman spectroscopy, and Mössbauer spectroscopy. The data revealed Co2+ in both tetrahedral (site A) octahedral B) sites of the cubic ferrite structure. For x⩽0.4 experimental indicated synthesis a core-shell structure, with hematite as shell cobalt core nanoparticle. Differences crystalline structure between two phases support evidences we found highly stressed...
Silver nanoparticles (AgNPs) exhibit outstanding antimicrobial properties, making them highly valuable in biomedical applications. This study presents the synthesis of a graphene oxide-silver nanoparticle (GO-Ag) nanocomposite via redox chemical reaction, where hydroxyl groups reduced silver ions present oxide (GO). Graphene was obtained through electrochemical exfoliation graphite, followed by ultrasonic presence to form GO-Ag. The materials were characterized using ultraviolet-visible...
Samples of ZnxMg1−xFe2O4 (0≤x≤1) synthesized by the combustion reaction method were investigated x-ray diffraction, Mössbauer spectroscopy, and Raman spectroscopy. All samples are found to have a cubic spinel structure lattice parameter increases linearly with increasing Zn-content (x). The data showed that replacement Mg2+ ions for Zn2+ changes substantially hyperfine parameter. Moreover, it was verified presence Fe3+ both in A B sites. spectra five predicted bands observed splitting A1g...
In this study, we report on the optical and magnetic properties of Co-doped ZnO nanoparticles with increasing Co-content (CoxZn1−xO; x = 0.000, 0.005, 0.010, 0.030, 0.050, 0.070, 0.100) synthesized by combustion reaction method. The X-ray diffraction patterns Raman spectra all samples indicated formation hexagonal wurtzite phase (space group C46V). data also show a secondary Co3O4 phase, which is barely seen in spectra. Photoacoustic spectroscopy electron paramagnetic resonance confirm...
The present work investigates the effect of initial microstructure on phase transformation after intercritical annealing by measuring amount austenite, which was obtained X-ray diffraction and saturation magnetisation. Pieces 8 Mn steel were austenitised at 1100°C for 1 h followed different cooling rates: water, air, furnace. Samples each piece subsequently intercritically annealed from 600 to 800°C air cooling. characterised using scanning electron microscopy backscatter diffraction....
Twinning‐induced plasticity steel is characterized by the presence of twins and austenite at room temperature. In this work, Fe–24Mn–3Al–1Ni–2Si–0.06C cold‐rolled 30, 50, 80% thickness reduction subsequently annealed temperatures between 300 1100 °C for 15 min. The microstructure hardness are analyzed, dislocation density, stacking fault, twin probability calculated using diffraction method based on intensity X‐rays generated in a synchrotron facility. Rietveld analysis Materials Analysis...
The microwave assisted combustion synthesis (MACS) as a new, quick and low cost method was used for preparation of niobium pentoxide (Nb2O5) powders. present paper investigated the effect reactant concentrations (ammonium oxalate, urea ammonium nitrate) on characteristics Nb2O5 nanoparticles. Three samples were synthesized with stoichiometric ratio between fuel oxidant (C1), excess (C2) (C3). In all samples, crystalline nanoparticles irregular morphology detected. smaller diameter in C2 C3...
Zinc Oxide (ZnO) has received a great deal of attention due the wide range its technological applications, including transparent conducting electrodes for solar cells, ultraviolet protection films, low-voltage and short-wavelength electro-optical devices. In addition, when doped with transition metal atoms (TM), ZnO exhibits ferromagnetic semiconducting properties, forming diluted magnetic semiconductor (DMS). This type material been extensively studied to potential use in spintronic devices...
In this work the results of Linear Raman Spectroscopy experiments on hafnium dioxide (HfO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> ) thin films deposited by magnetron sputtering using different deposition conditions and post-deposition annealing are reported. bands were identified considering active symmetry modes expected from a tetragonal or monoclinic phase. The as-deposited HfO...