Determination of Dy substitution site in Nd_2-xDy_xFe₁₄B by HAADF-STEM and illustration of magnetic anisotropy of "g" and "f" sites, before and after substitution.

ABSTRACT: Nd₂Fe₁₄B and Nd_2-xDy_xFe₁₄B (x = 0.25, 0.50) particles were prepared by the modified co-precipitation followed by reduction-diffusion process. Bright field scanning transmission electron microscope (BF-STEM) image revealed the formation of Nd-Fe-B trigonal prisms in [- 101] viewing zone axis, confirming the formation of Nd₂Fe₁₄B/Nd_2-xDy_xFe₁₄B. Accurate site for the Dy substitution in Nd₂Fe₁₄B crystal structure was determined as "f" site by using high-angle annular dark field scanning transmission electron microscope (HAADF-STEM). It was found that all the "g" sites are occupied by the Nd, meanwhile Dy occupied only the "f" site. Anti-ferromagnetic coupling at "

SUBMITTER: Haider SK 

PROVIDER: S-EPMC7973419 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature