Synthesis of nanopowders Nd<SUB align="right">2Fe<SUB align="right">14B by chemical method

The paper presents a description of a new chemical method for the synthesis of magnetic nanoparticles of the intermetallic compound Nd2Fe14B, which consists of several stages. At the first stage, nanoparticles of neodymium oxide Nd2O3, iron oxide Fe2O3, and iron borate Fe3BO6 were synthesised by chemical deposition methods. At the second stage, the powders were mixed in the required proportion and reduced using a two-stage diffusion-reduction process: first, at 800°C in an Ar + 5% H2 medium, and then, to form the Nd2Fe14B phase, the powder mixture was added calcium hydride powder, the resulting mixture was pressed into a tablet, and at 800°C in an Ar medium, the calci-thermal reduction-diffusion synthesis was carried out. At the third stage, Nd2Fe14B nanopowders were separated from calcium oxide CaO by washing the resulting product with a solution of ammonium hydroxide and ethanol NH4Cl/C2H5OH. The phase composition, structure and morphology of the particles were determined by X-ray diffraction (XRD), scanning (SEM) and transmission (TEM) electron microscopy. Particle sizes were determined by dynamic light scattering (DLS). The composition of nanoparticles was determined using an energy dispersive X-ray spectrometer (EDS). XRD results indicate a high efficiency of the proposed method for the preparation of nanopowders of the intermetallic compound Nd2Fe14B.

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