The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles

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,...

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Main Authors: Deheri, P. K., Shukla, S., Ramanujan, Raju V.
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/85267
http://hdl.handle.net/10220/11288
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-852672020-06-01T10:21:23Z The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles Deheri, P. K. Shukla, S. Ramanujan, Raju V. School of Materials Science & Engineering 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. 2013-07-12T03:25:52Z 2019-12-06T16:00:39Z 2013-07-12T03:25:52Z 2019-12-06T16:00:39Z 2011 2011 Journal Article 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. 0022-4596 https://hdl.handle.net/10356/85267 http://hdl.handle.net/10220/11288 10.1016/j.jssc.2011.11.022 en Journal of solid state chemistry © 2011 Elsevier Inc.
institution Nanyang Technological University
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language English
description 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.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Deheri, P. K.
Shukla, S.
Ramanujan, Raju V.
format Article
author Deheri, P. K.
Shukla, S.
Ramanujan, Raju V.
spellingShingle Deheri, P. K.
Shukla, S.
Ramanujan, Raju V.
The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
author_sort Deheri, P. K.
title The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
title_short The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
title_full The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
title_fullStr The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
title_full_unstemmed The reaction mechanism of formation of chemically synthesized Nd2Fe14B hard magnetic nanoparticles
title_sort reaction mechanism of formation of chemically synthesized nd2fe14b hard magnetic nanoparticles
publishDate 2013
url https://hdl.handle.net/10356/85267
http://hdl.handle.net/10220/11288
_version_ 1681058288569942016