Journal
SCRIPTA MATERIALIA
Volume 59, Issue 2, Pages 179-182Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2008.03.004
Keywords
NdFeB magnets; Nd-rich phase; crystal structure; oxygen content
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The crystal structures and composition of the intergranular Nd-rich phase were investigated in a ternary Nd-Fe-B sintered magnet by transmission electron microscopy. The O and Nd contents of the Nd-rich phase of various crystal structures varied greatly, whereas the Fe content was virtually unchanged. The crystal structure of the Nd-rich phase mainly depends on its O content. As the O content increases, the structures of the Nd-rich phase change as follows: double close-packed hexagonal -> face-centered cubic -> close-packed hexagonal. The corresponding O content of each structure is determined. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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