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000893187 1001_ $$0P:(DE-HGF)0$$aSoderžnik, Kristina Žagar$$b0$$eCorresponding author
000893187 245__ $$aMicrostructural insights into the coercivity enhancement of grain-boundary-diffusion-processed Tb-treated Nd-Fe-B sintered magnets beyond the core-shell formation mechanism
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000893187 520__ $$aWe propose a dominant core-shell formation mechanism for grain-boundary-diffusion-processed (GBDP), Tb-treated, Nd2Fe14B sintered magnets. A depth-sensitive analysis of Tb-treated samples, relative to a non-GBDP Nd2Fe14B magnet, showed a 30% increase of the coercivity in the central part of the magnet. A structure-chemistry-magnetic-property analysis revealed the dominant GBDP mechanism. On the surface of the Tb-treated magnet, the Tb is released from the starting precursor following a cascade of chemical reactions between the Tb oxide and the Nd and/or the Nd-Fe-B. The released Tb diffuses along the grain boundaries, forming a core-shell structure. The calculated optimum concentration for a 30% increase in the coercivity was 50 ppm of Tb. Off-axis electron-holography measurements were used to quantitatively map the characteristic magnetic states of the samples, confirming a different magnetic domain structure in the shell than in the core. The magnetic induction in the core was found to be 26% higher than that of the shell, which has a lower magnetic saturation due to the presence of Tb. The results show that the measured increase in the coercivity is due to a structural effect, and not the magnetic contribution of the Tb. Our results pave the way towards grain-boundary-engineering studies that can be used to increase the coercivity of Nd-Fe-B magnets for e-mobility and eco-power applications.
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000893187 536__ $$0G:(EU-Grant)856538$$a3D MAGiC - Three-dimensional magnetization textures: Discovery and control on the nanoscale (856538)$$c856538$$fERC-2019-SyG$$x2
000893187 536__ $$0G:(GEPRIS)405553726$$aDFG project 405553726 - TRR 270: Hysterese-Design magnetischer Materialien für effiziente Energieumwandlung (405553726)$$c405553726$$x3
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000893187 7001_ $$0P:(DE-HGF)0$$aRožman, Kristina Žužek$$b1
000893187 7001_ $$0P:(DE-HGF)0$$aKomelj, Matej$$b2
000893187 7001_ $$0P:(DE-Juel1)144926$$aKovács, András$$b3
000893187 7001_ $$0P:(DE-Juel1)162274$$aDiehle, Patrick$$b4
000893187 7001_ $$0P:(DE-Juel1)172928$$aDenneulin, Thibaud$$b5$$ufzj
000893187 7001_ $$0P:(DE-Juel1)159473$$aSavenko, Aleksei$$b6
000893187 7001_ $$0P:(DE-HGF)0$$aSoderžnik, Marko$$b7
000893187 7001_ $$0P:(DE-HGF)0$$aKobe, Spomenka$$b8
000893187 7001_ $$0P:(DE-Juel1)144121$$aDunin-Borkowski, Rafal E.$$b9$$ufzj
000893187 7001_ $$0P:(DE-Juel1)130824$$aMayer, Joachim$$b10$$ufzj
000893187 7001_ $$0P:(DE-HGF)0$$aMarkoli, Boštjan$$b11
000893187 7001_ $$0P:(DE-HGF)0$$aŠturm, Sašo$$b12
000893187 773__ $$0PERI:(DE-600)2012675-X$$a10.1016/j.jallcom.2021.158915$$gVol. 864, p. 158915 -$$p158915 -$$tJournal of alloys and compounds$$v864$$x0925-8388$$y2021
000893187 8564_ $$uhttps://juser.fz-juelich.de/record/893187/files/1-s2.0-S0925838821003224-main.pdf$$yOpenAccess
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