A Mössbauer effect study of the structural and magnetic properties of Y2(Fe1−xAlx) 14B

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Abstract
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.

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