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Misorientations across boundary planes in a sintered NdFeB permanent magnet

From the perspective of crystallography, there exist crystals as well as boundary planes in NdFeB permanent magnets and accordingly, there should exist orientation textures of Nd(2)Fe(14)B crystals and orientation texture of boundary planes. This work therefore aims to study the misorientations acro...

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Autores principales: Yuan, Xiaokun, Zhu, Jie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9277534/
https://www.ncbi.nlm.nih.gov/pubmed/35919597
http://dx.doi.org/10.1039/d2ra01670b
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author Yuan, Xiaokun
Zhu, Jie
author_facet Yuan, Xiaokun
Zhu, Jie
author_sort Yuan, Xiaokun
collection PubMed
description From the perspective of crystallography, there exist crystals as well as boundary planes in NdFeB permanent magnets and accordingly, there should exist orientation textures of Nd(2)Fe(14)B crystals and orientation texture of boundary planes. This work therefore aims to study the misorientations across boundary planes in a sintered NdFeB permanent magnet. As an interdisciplinary study, serial stereological methods are developed to extract more structural information from the material and as the result, spreading wetting and penetration of Nd-Rich phases to the Nd(2)Fe(14)B phase are quantificationally characterized. The entire boundaries are sorted into Nd(2)Fe(14)B/Nd(2)Fe(14)B grain boundaries (N/N boundaries) and Nd(2)Fe(14)B/(thin-layer-like)Nd-Rich phase boundaries (N/R boundaries). 31°/[0 0 1] and 60°/[0 0 1] twist boundaries are preferred among N/N boundaries, while 31°/[0 0 1] and 72°/[0 0 1] misorientations are preferred among N/R boundaries. The structural features of these misorientations are elaborated via the Five Parameter Analysis (FPA) method. The potential correlations between the grain boundary plane distributions (GBPDs) and magnetic properties are then discussed regarding how the anisotropic features at boundary locations impact coercivity, domain and remanence.
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spelling pubmed-92775342022-08-01 Misorientations across boundary planes in a sintered NdFeB permanent magnet Yuan, Xiaokun Zhu, Jie RSC Adv Chemistry From the perspective of crystallography, there exist crystals as well as boundary planes in NdFeB permanent magnets and accordingly, there should exist orientation textures of Nd(2)Fe(14)B crystals and orientation texture of boundary planes. This work therefore aims to study the misorientations across boundary planes in a sintered NdFeB permanent magnet. As an interdisciplinary study, serial stereological methods are developed to extract more structural information from the material and as the result, spreading wetting and penetration of Nd-Rich phases to the Nd(2)Fe(14)B phase are quantificationally characterized. The entire boundaries are sorted into Nd(2)Fe(14)B/Nd(2)Fe(14)B grain boundaries (N/N boundaries) and Nd(2)Fe(14)B/(thin-layer-like)Nd-Rich phase boundaries (N/R boundaries). 31°/[0 0 1] and 60°/[0 0 1] twist boundaries are preferred among N/N boundaries, while 31°/[0 0 1] and 72°/[0 0 1] misorientations are preferred among N/R boundaries. The structural features of these misorientations are elaborated via the Five Parameter Analysis (FPA) method. The potential correlations between the grain boundary plane distributions (GBPDs) and magnetic properties are then discussed regarding how the anisotropic features at boundary locations impact coercivity, domain and remanence. The Royal Society of Chemistry 2022-07-13 /pmc/articles/PMC9277534/ /pubmed/35919597 http://dx.doi.org/10.1039/d2ra01670b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Yuan, Xiaokun
Zhu, Jie
Misorientations across boundary planes in a sintered NdFeB permanent magnet
title Misorientations across boundary planes in a sintered NdFeB permanent magnet
title_full Misorientations across boundary planes in a sintered NdFeB permanent magnet
title_fullStr Misorientations across boundary planes in a sintered NdFeB permanent magnet
title_full_unstemmed Misorientations across boundary planes in a sintered NdFeB permanent magnet
title_short Misorientations across boundary planes in a sintered NdFeB permanent magnet
title_sort misorientations across boundary planes in a sintered ndfeb permanent magnet
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9277534/
https://www.ncbi.nlm.nih.gov/pubmed/35919597
http://dx.doi.org/10.1039/d2ra01670b
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