The crystallographic and magnetic properties of Y₂(Fe₁₋ₓAlₓ)₁₄B, where x equals 0.00, 0.02, 0.04, 0.06, and 0.08, have been investigated by Mössbauer spectroscopy and magnetic measurements at room temperature and 85 K. Magnetic anisotropy and magnetization changes with aluminum substitution indicate that, because of size, the aluminum preferentially occupies the j₂ site over the remaining five crystallographically nonequivalent iron sites. This preferential occupation has been confirmed by Mössbauer spectral studies, which indicate that the compositional variation of the hyperfine field for each site is related to the number of near-neighbor aluminum atoms for the site. This compositional variation is helpful in assigning the different spectral components in these alloys as well as in the related Nd₂(Fe₁₋ₓCoₓ)₁₄B and Y₂(Fe₁₋ₓCoₓ)₁₄B alloys. In all cases these assignments are consistent with the local symmetry and coordination environment for each site.
Y. Yang et al., "A Mössbauer Effect Study of the Structural and Magnetic Properties of Y₂(Fe₁₋ₓAlₓ)₁₄B," Journal of Applied Physics, vol. 61, no. 8, American Institute of Physics (AIP), Jan 1987.
The definitive version is available at http://dx.doi.org/10.1063/1.338961
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