Structural, Morphological and Magnetic Properties of FeCo-(Fe,Co)3O4 Nanocomposite Synthesized by Proteic Sol-Gel Method Using a Rotary Oven

Abstract

FeCo nanoparticles coated with (Fe,Co) 3 O 4 (magnetite doped with cobalt) were synthesized by the proteic sol-gel chemical route. The synthesized materials were characterized by Thermogravimetry (TG), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), vibrating-sample magnetometer (VSM) and Mössbauer spectroscopy (MS). The results show that the increase in temperature and the choice of the correct air/N 2 flow directly influence on the final physical-chemical properties of the nanocomposite. The SEM and TEM images confirmed that a thin layer of oxide was formed on the alloy, indicating that it was obtained a self-assembled FeCo-(Fe,Co) 3 O 4 nanocomposites. In addition, the VSM results show that a possible exchange-spring coupling in magnetic FeCo-(Fe,Co) 3 O 4 nanoparticles occurred with high saturation magnetization from FeCo alloy and high coercivity from (Fe,Co) 3 O 4. The rotary oven allows the uniform contact of the powder with the atmosphere of synthesis during the different oxidation-reduction steps, generating more homogeneous particles.

Sol-Gel Synthesis Control of Iron-Cobalt Alloy/Ferrite Core/Shell Nanoparticles Supported by a Carbon Medium with Semi-Hard Magnetic Features

“…Summarizing, here we report one of the most homogeneous and lowest ratios between core-size and shell-thickness, as compared to some other reported Co-ferrite capped Fe-Co cores [7,28,33,68], along with a good degree of tunability of the core alloys.…”

“…By contrast, the sol-gel method is performed in acid pH and considerably reduces the particle sizes up to ∼10-70 nm. It is usually based on macromolecules or biopolymers [33][34][35], polyol with post-annealing method [7,26], or wet impregnation and co-precipitation techniques [36]. In this sense, small NPs could be advantageous in the framework of the hardening-engineering of magnetic materials.…”

Atomic-Scale Description of the Magnetic TiN|FeCo Multilayers

“…On the other hand, the FeCo alloy is a highly magnetic material and crystallizes in the cubic structure with the Pm 3̅m space group . It is considered a soft magnetic material that operates at high temperatures.…”

“…On the other hand, the FeCo alloy is a highly magnetic material and crystallizes in the cubic structure with the Pm 3̅m space group. 21 It is considered a soft magnetic material that operates at high temperatures. These kinds of materials can be easily magnetized and demagnetized by the influence of a small external field.…”

Synthesis of Fe2SiO4-Fe7Co3 Nanocomposite Dispersed in the Mesoporous SBA-15: Application as Magnetically Separable Adsorbent

“…In addition, it is worth mentioning that previous studies suggest that the temperature reduction and the hydrogen flow rate affect directly the physicochemical properties of the iron and cobalt based oxide-alloy mixture [35,36]. Therefore, different reduction temperatures and H 2 flow rates were used in the synthesis of nanocomposite containing Fe 2 SiO 4 -Fe 7 Co 3 dispersed in the mesoporous SBA-15 in order to evaluate these effects.…”