Characterization of FeO Nanoparticles for Applications in Catalytic Activity in the Adsorption/Degradation of Methylene Blue and Esterification.

The aim of this study is to evaluate the applicability of the catalytic activity (CA) of the FeO magnetic system in the adsorption/degradation of methylene blue and esterification. The thermal decomposition method allowed the preparation of FeO nanoparticles. The crystallites of the FeO structural phase present an acicular form confirmed by X-ray diffraction.

Production and Characterization of Nanostructured Powders of NdFeB and FeAl by Mechanical Alloying.

The objective of this work is to evaluate the applicability of exchange coupling between nanoparticles of NdFeB (hard magnetic material) and FeAl (soft magnetic material), as permanent magnets produced by surfactant-assisted mechanical alloying. The obtained powders were then mixed with 85% of the NdFeB system and 15% of the FeAl system and subsequently sintered at 300 °C, 400 °C and 500 °C for one hour. The results obtained by Mössbauer spectrometry (MS) show a ferromagnetic behavior with six magnetic sites represented by sextets (16k1, 16k2, 8j1, 8j2, 4c and 4e), characteristic of the NdFeB system.

Mechanochemical Synthesis and Nitrogenation of the NdFeCoTi Alloy for Permanent Magnet.

In this work, the mechanochemical synthesis method was used for the first time to produce powders of the nanocrystalline NdFeCoTi compound from NdO, FeO, Co and TiO. High-energy-milled powders were heat treated at 1000 °C for 10 min to obtain the ThMn-type structure. Volume fraction of the 1:12 phase was found to be as high as 95.