Please use this identifier to cite or link to this item:
Title: The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
Authors: Deheri, P. K.
Shukla, S.
Ramanujan, Raju V.
Issue Date: 2011
Source: Deheri, P., Shukla, S., & Ramanujan, R. (2012). The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles. Journal of Solid State Chemistry, 186, 224-230.
Series/Report no.: Journal of solid state chemistry
Abstract: Nd2Fe14B based magnetic materials exhibit excellent magnetic properties and are widely used in many engineering applications. However, chemical synthesis of this compound is challenging. In this work, the formation mechanism of chemically synthesized Nd2Fe14B magnetic nanoparticles was studied. Nd, Fe and B precursors were converted to Nd–Fe–B oxide by the sol–gel method, reduction of these oxides by CaH2 resulted in Nd2Fe14B nanoparticles. Nd2Fe14B phase formation resulted from two competing reactions: (a) Nd2Fe14B phase formation by direct combination of NdH2, Fe and B, (b) Nd2Fe17 phase formation from NdH2 and Fe, followed by Nd2Fe14B phase formation by the reaction of Nd2Fe17 and B. Addition of boron to Nd–Fe–B oxide during reduction resulted in improved magnetic properties. The activation energy for Nd2Fe14B phase formation was found to be 365 kJ mol−1. The optimum heat treatment temperature and time for Nd2Fe14B phase formation were found to be 800 °C and 90 min, respectively.
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2011.11.022
Rights: © 2011 Elsevier Inc.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.