Magnetic Structures of Y₆(Fe₁₋ₓAlₓ)₂₃ Compounds
Neutron diffraction studies of three Y6(Fe1-xAlx)23 compounds (x = 0.05, 0.10, 0.15) at 523 K and 77 K reveal substantial preferential atomic ordering of Fe and Al atoms on the four transition metal crystallographic sites. Fe atoms prefer to occupy the f1 site and Al atoms the f2 site. The site preferences are explained on the basis of the comparative atomic volumes and the nearest neighbor distances. At 77 K the compounds are ferromagnetic. The moments of the Fe atoms lie along the <111> direction and exhibit different magnetic moments on the four transition metal crystallographic sites. The decrease in the Curie temperature and magnetization of Y6Fe23 with increasing Al content arises as a result of two effects, dilution of the Fe sublattice with nonmagnetic atoms and changes in the preferential atomic ordering which governs the local enviroments of the Fe atoms so as to decrease the average Fe moment.
R. J. Gan et al., "Magnetic Structures of Y₆(Fe₁₋ₓAlₓ)₂₃ Compounds," IEEE Transactions on Magnetics, Institute of Electrical and Electronics Engineers (IEEE), Jan 1985.
The definitive version is available at http://dx.doi.org/10.1109/TMAG.1985.1063975
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© 1985 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.