Magnetic and structural properties of Lu2(Fe, Mn)17Hy hydrides
The Lu2Fe17−xMnxHy, x = 0–2, y = 0–3, hydrides with the Th2Ni17-type crystal structure were prepared and their structural and magnetic parameters were studied. The lattice parameters measured at room temperature increase smoothly with H content. The magnetic measurements indicate that the Lu2Fe17Hy hydrides (with y up to 1.77) are antiferromagnets at high temperatures and ferromagnets at low temperatures. The Lu2Fe16.5Mn0.5 compound also has a high temperature antiferromagnetic state, but its hydrides are ferromagnets only. The Lu2Fe17−xMnxHy hydrides, with x = 0.7 and 2, are ferromagnets with Tc monotonically increasing with H content. The saturation magnetization measured for Lu2Fe17−xMnxHy, (x = 0,0.5,0.7,2 and 0
Real crystal structure and magnetic state of Ce2Fe17 compounds
Abstract The crystal structure and magnetic state of the compounds Ce 2 Fe17, with Curie temperature T C ranging from 20 to 116 K, but almost constant Neel temperatures T N ≈ 206 K, were studied by X-ray and neutron–diffraction methods and magnetic measurements. The relation between the magnetic state and the real crystal structure of Ce 2 Fe 17 is discussed.
Analysis of the intrinsic magnetic properties of R 2 Fe 17 single crystals (R=Y,nDy,nHo,nEr)
The magnetic behavior of some R{sub 2}Fe{sub 17} single crystals have been analyzed quantitatively in a wide temperature range, using a two-sublattice approximation for the magnetic structure and taking into account isotropic exchange and single-ion crystal-field interactions. The 3d sublattice behavior has been described phenomenologically, from the study of the experimental magnetization results in a Y{sub 2}Fe{sub 17} single crystal. The parameters A{sub 2}{sup 0}, A{sub 4}{sup 0}, A{sub 6}{sup 0}, A{sub 6}{sup 6}, describing the crystal-field interaction in the different R{sub 2}Fe{sub 17} compounds (R=Er, Dy, Ho) have been determined. The calculated magnetic behavior shows good agreement with experimental magnetization results in the temperature range 4.2 to 300 K, demonstrating the reliability of the determined parameters. {copyright} {ital 1997} {ital The American Physical Society}