Aluminum-substituted Nd2Fe17-xAlx solid solutions with x=2.30, 4.44, 6.13, 8.00, and 9.40 have been studied by neutron diffraction and Mössbauer spectroscopy. A Rietveld analysis of the neutron scattering indicates that the aluminum atoms have a high initial affinity for the 18h site, show a high affinity for the 6c site at high aluminum concentrations, and are absent from the 9d site at all aluminum concentrations. The Mössbauer spectra show a maximum in both the maximum and weighted average hyperfine field for x≅2. This indicates that the lattice expansion which occurs with aluminum substitution is sufficient, at least for small values of x, where magnetic dilution is small, to enhance the intrasublattice coupling between the iron moments, and to increase the magnetic hyperfine fields.
W. B. Yelon et al., "Neutron Diffraction and Mössbauer Effect Study of Several Nd2Fe17-xAlx Solid Solutions," Journal of Applied Physics, vol. 73, no. 10, pp. 6029-6031, American Institute of Physics Publishing LLC, Nov 1994.
The definitive version is available at http://dx.doi.org/10.1063/1.353459
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