Abstract
Magnetic Ni-Mn mixed oxides based on nanoparticles (NPs) have been developed at 700 °C using a ceramic method and a glycine-assisted auto combustion path. The thermogravimetry–derivative thermogravimetry (TG—DTG), infrared radiation (IR), X-ray powder diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and high resolution transmittance electron micrographs (HRTEM) techniques have been used to characterize as synthesized nanomaterials by evaluating their thermal behavior, structure, distinguishing the components and establishing the morphology. A vibrating sample magnetometer has been used to estimate the magnetic properties of the materials (VSM). The analyses indicate that using a glycine-assisted auto combustion method resulted in formation of cubic spinel NiMn2O4 NPs as a single phase. The ceramic process, from the other side, led to the development of Mn2O3/NiMnO3/NiMn2O4 nanocomposite. The resulting particles being polycrystalline, including average sizes ranging from 10 to 80 nanometers. The prepared NiMn2O4 NPs showed room-temperature ferromagnetism, with an optimal saturation magnetization value of 5.0216 emu/g, according to the magnetic measurement.
Highlights
Most mixed transition metal oxides-based nanomaterials have recently evoked strong interest in various structures with stoichiometric or even non-stoichiometric compositions.the interest in nanoparticle physics has increased markedly because its physical and chemical properties differ compared to the corresponding bulk ones
The DTG peaks were observed at 250 ◦ C, 325 ◦ C and 430 ◦ C with weight loss ~7.7% which corresponds to the complete formation of Mn2 O3 and NiMnO3
In continuation of our previous work, we seek in this study to decrease the preparation temperature of NiMn2 O4 solid by altering the fuel material from egg white to glycine. This is what made us dealt with the traditional ceramic method for making a comparative study with the combustion method based on glycine
Summary
The interest in nanoparticle physics has increased markedly because its physical and chemical properties differ compared to the corresponding bulk ones. These materials display a vast range of fascinating electrical, surface, catalytic and magnetic properties which often come about due to the mixed valence states of these oxides. A2+ and B3+ cations occupy a section including all of the tetrahedral and octahedral sites, respectively, in these compounds, which have been developed around a dense array of O2− ions. The abundance of cationic holes improves the electric conductivity and the magnetic activity by providing more active sites for catalytic processes [3].
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