Partitioning of Tb and Dy at the liquid/Nd₂Fe₁₄B interface in Nd–Fe–B magnets: insights from single crystal growth
Abstract
Heavy rare earth elements (HREE) such as dysprosium (Dy) and terbium (Tb) are added to Nd-Fe-B permanent magnets to increase their coercivity. However, optimizing both the content and distribution of HREE requires a thorough understanding of the thermodynamic equilibria at the interfaces between the τ 1 -phase grains and the liquid phase that forms during grain boundary diffusion or powder mixing processes. In this study, we synthesized τ 1 -phase single crystals using the flux growth method with Nd-HREE-Fe-B flux alloys containing various HREE concentrations. Following the crystal growth, phase separation was performed by centrifugation. The composition of the τ 1 single crystals was analyzed by wavelength dispersive spectroscopy (WDS), while the liquid phase was characterized by inductively coupled plasma (ICP) spectroscopy. The partitioning laws of HREE between the τ 1 phase and the equilibrium liquid phase were determined, providing valuable insights into the optimisation of HREE content in Nd-Fe-B magnets.
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BibTeX
@article{mouron2026partitioning,
title = {{Partitioning of Tb and Dy at the liquid/Nd₂Fe₁₄B interface in Nd–Fe–B magnets: insights from single crystal growth}},
author = {Raphaël Mouron and Cyril Rado and Eric Robin and Gérard Lapertot},
journal = {Journal of Alloys and Compounds},
year = {2026},
month = sep,
doi = {10.1016/j.jallcom.2025.185085},
url = {https://cea.hal.science/cea-05739352v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Partitioning of Tb and Dy at the liquid/Nd₂Fe₁₄B interface in Nd–Fe–B magnets: insights from single crystal growth
AU - Raphaël Mouron
AU - Cyril Rado
AU - Eric Robin
AU - Gérard Lapertot
PY - 2026
DA - 2026/09/04
JO - Journal of Alloys and Compounds
DO - 10.1016/j.jallcom.2025.185085
UR - https://cea.hal.science/cea-05739352v1
AB - Heavy rare earth elements (HREE) such as dysprosium (Dy) and terbium (Tb) are added to Nd-Fe-B permanent magnets to increase their coercivity. However, optimizing both the content and distribution of HREE requires a thorough understanding of the thermodynamic equilibria at the interfaces between the τ 1 -phase grains and the liquid phase that forms during grain boundary diffusion or powder mixing processes. In this study, we synthesized τ 1 -phase single crystals using the flux growth method with Nd-HREE-Fe-B flux alloys containing various HREE concentrations. Following the crystal growth, phase separation was performed by centrifugation. The composition of the τ 1 single crystals was analyzed by wavelength dispersive spectroscopy (WDS), while the liquid phase was characterized by inductively coupled plasma (ICP) spectroscopy. The partitioning laws of HREE between the τ 1 phase and the equilibrium liquid phase were determined, providing valuable insights into the optimisation of HREE content in Nd-Fe-B magnets.
SN - 0925-8388
ER -