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000865912 1001_ $$0P:(DE-HGF)0$$aTitov, Ivan$$b0$$eCorresponding author
000865912 245__ $$aEffect of grain-boundary diffusion process on the geometry of the grain microstructure of Nd − Fe − B nanocrystalline magnets
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000865912 520__ $$aHot-deformed anisotropic Nd−Fe−B nanocrystalline magnets have been subjected to the grain-boundary diffusion process (GBDP) using a Pr70Cu30 eutectic alloy. The resulting grain microstructure, consisting of shape-anisotropic Nd−Fe−B nanocrystals surrounded by a Pr−Cu-rich intergranular grain-boundary phase, has been investigated using unpolarized small-angle neutron scattering and very small-angle neutron scattering. The neutron data have been analyzed using the generalized Guinier-Porod model and by computing, model independently, the distance distribution function. We find that the GBDP results in a change of the geometry of the scattering particles: In the small-q regime, the scattering from the as-prepared sample exhibits a slope of about 2, which is characteristic for the scattering from two-dimensional platelet-shaped objects, while the GBDP sample manifests a slope of about 1, which is the scattering signature of one-dimensional elongated objects. The evolution of the Porod exponent indicates the smoothing of the grain surfaces due to the GBDP, which is accompanied by an increase of the coercivity.
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000865912 7001_ $$0P:(DE-HGF)0$$aBarbieri, Massimiliano$$b1
000865912 7001_ $$0P:(DE-HGF)0$$aBender, Philipp$$b2
000865912 7001_ $$0P:(DE-HGF)0$$aPeral, Inma$$b3
000865912 7001_ $$0P:(DE-HGF)0$$aKohlbrecher, Joachim$$b4
000865912 7001_ $$0P:(DE-HGF)0$$aSaito, Kotaro$$b5
000865912 7001_ $$0P:(DE-Juel1)130893$$aPipich, Vitaliy$$b6
000865912 7001_ $$0P:(DE-HGF)0$$aYano, Masao$$b7
000865912 7001_ $$00000-0002-2786-295X$$aMichels, Andreas$$b8
000865912 773__ $$0PERI:(DE-600)2898355-5$$a10.1103/PhysRevMaterials.3.084410$$gVol. 3, no. 8, p. 084410$$n8$$p084410$$tPhysical review materials$$v3$$x2475-9953$$y2019
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