Atomic-Resolution X-ray Energy-Dispersive Spectroscopy Chemical Mapping of Substitutional Dy Atoms in a High-Coercivity Neodymium Magnet
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概要
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We have investigated local element distributions in a Dy-doped Nd<inf>2</inf>Fe<inf>14</inf>B hot-deformed magnet by atomic-column resolution chemical mapping using an X-ray energy-dispersive spectrometer (XEDS) attached to an aberration-corrected scanning transmission electron microscope (Cs-corrected STEM). The positions of the Nd and Dy atomic columns were visualized in the XEDS maps. The substitution of Dy was limited to a surface layer 2--3 unit cells thick in the Nd<inf>2</inf>Fe<inf>14</inf>B grains, and the Dy atoms preferentially occupied the 4f-Nd sites of Nd<inf>2</inf>Fe<inf>14</inf>B. These results provide further insights into the principal mechanism governing the coercivity enhancement due to Dy doping.
- 2013-05-25
著者
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Itakura Masaru
Department Of Applied Science For Electronics And Materials Kyushu University
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Watanabe Natsuki
Department Of Applied Chemistry School Of Advanced Science And Engineering Waseda University
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Nishida Minoru
Department Of Applied Chemistry Faculty Of Science Science University Of Tokyo Kagurazaka
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Daio Takeshi
HVEM Laboratory, Kyushu University, Fukuoka 819-0395, Japan
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Matsumura Syo
HVEM Laboratory, Kyushu University, Fukuoka 819-0395, Japan
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