Title: Synthesis of nanopowders Nd₂Fe₁₄B by chemical method

Authors: O.E. Abdurakhmonov; M.E. Alisultanov; E.V. Yurtov; E.S. Savchenko; A.G. Savchenko

Addresses: Department of Nanomaterials and Nanotechnology, D. Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, Moscow, 125047, Russian Federation ' Department of Nanomaterials and Nanotechnology, D. Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, Moscow, 125047, Russian Federation ' Department of Nanomaterials and Nanotechnology, D. Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, Moscow, 125047, Russian Federation ' Department of Physical Materials Science, National Research Technological University "MISiS", Leninsky Prospect, 4, Moscow, 119049, Russian Federation ' Department of Physical Materials Science, National Research Technological University "MISiS", Leninsky Prospect, 4, Moscow, 119049, Russian Federation

Abstract: 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.

Keywords: chemical synthesis; deposition; diffusion-reduction process; nanopowders Nd₂Fe₁₄B; nanoparticles; morphology.

DOI: 10.1504/IJNT.2024.136504

International Journal of Nanotechnology, 2024 Vol.21 No.1/2, pp.3 - 16

Published online: 05 Feb 2024 *

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