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- W3085205789 abstract "Although crystallographic properties are considered to be intrinsic, several studies have reported significant different values for the lattice constants of the $mathrm{N}{mathrm{d}}_{2}mathrm{F}{mathrm{e}}_{14}mathrm{B}$ phase. In this study, by analyzing rod-shaped isotropic (randomly oriented) and anisotropic ($c$-axis oriented) Nd-Fe-B bulk-sintered magnets, their powdered counterparts, and powder made from grinding a single crystal, we experimentally demonstrate that the lattice constants of the $mathrm{N}{mathrm{d}}_{2}mathrm{F}{mathrm{e}}_{14}mathrm{B}$ phase in the ferromagnetic ordering state depend on the sample texture. The temperature dependence of the lattice constants was investigated by focusing on their expansion associated with ferromagnetic ordering, that is, the spontaneous linear expansion along the $a$-axis (${ensuremath{lambda}}_{a}$) and $c$-axis (${ensuremath{lambda}}_{c}$). The ${ensuremath{lambda}}_{a}$ value of the isotropic (anisotropic) bulk-sintered magnets at 105 K is 10% (2%) smaller while the ${ensuremath{lambda}}_{c}$ value is 130% (40%) greater than that of the powdered single crystal. These results indicate the presence of an internal stress perpendicular to the $c$-axis in the isotropic and anisotropic bulk-sintered magnets. In addition, we observed that the ratios of the length along the $a$-axis to that along the $c$-axis ($c/a$) for the various Nd-Fe-B magnets as well as those reported previously are correlated to the sample texture. In other words, the $c/a$ values of the sintered magnets are greater than those of the powdered samples. This result suggests that the sample texture and hence the internal stress has a determining effect on the lattice constants." @default.
- W3085205789 created "2020-09-21" @default.
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- W3085205789 date "2020-09-14" @default.
- W3085205789 modified "2023-09-25" @default.
- W3085205789 title "Effects of texture on lattice constants of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi mathvariant=normal>N</mml:mi><mml:msub><mml:mi mathvariant=normal>d</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>F</mml:mi><mml:msub><mml:mi mathvariant=normal>e</mml:mi><mml:mn>14</mml:mn></mml:msub><mml:mi mathvariant=normal>B</mml:mi></mml:mrow></mml:math> and their relationship with internal stress in Nd-Fe-B permanent magnets" @default.
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- W3085205789 doi "https://doi.org/10.1103/physrevmaterials.4.094405" @default.
- W3085205789 hasPublicationYear "2020" @default.
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