X-RAY-DIFFRACTION AND NUCLEAR-MAGNETIC-RESONANCE STUDIES OF Y2FE17

X-ray structure analysis and Y-89 nuclear magnetic resonance (NMR) mea surements are presented for the hexagonal and rhombohedral phases of Y 2Fe17. The rhombohedral structure has one Y site (designated 6c) and t he hexagonal structure has two Y sites (designated 2b and 2d). By comb ining the x-ray and NMR results, the hyperfine fields corresponding to the three Y sites in these two phases are obtained. Furthermore, a de convolution of the NMR spectrum for Y-89 in the hexagonal Y2Fe17 phase shows that a disordering exists, resulting in an occupancy for the Y 2b sites of approximately 71%. (C) 1996 American Institute of Physics.