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Yasukazu Murakami, Taisuke Sasaki, Tadakatsu Ohkubo, Kazuhiro Hono, B23-P-02
Strain analysis from Nd-Fe-B sintered magnet using artificial moiré fringes , Microscopy, Volume 64, Issue suppl_1, November 2015, Page i112, https://doi.org/10.1093/jmicro/dfv276 - Share Icon Share
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Strain distribution in a Nd-Fe-B sintered magnet was revealed by analyzing artificial moiré fringes [ 1 ] which were observed in scanning transmission electron microscopy images. A frequency analysis using the artificial moiré fringes (Fig. 1 ) provided essential information about the elongation/contraction of the spacing of c planes in Nd 2 Fe 14 B grains. A maximum value of strain, ∼1.2 %, was observed in the Nd2Fe14B grain neighboring the metallic-Nd phase which was produced in a triple junction. The grains neighboring the oxides (i.e., Nd 2 O 3 and NdO x ) showed the strains of 0.4-0.5 %. In the vicinity of the grain boundary phase, which was sandwiched by two Nd 2 Fe 14 B grains, the analysis of the moiré fringes did not show appreciable strain. The results offer useful information for understanding of the role of lattice strain in depressing the magnetocrystalline anisotropy in the Nd 2 Fe 14 B phase [ 2 ].