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 < y < 3) hydrides is practically insensitive to hydrogen concentration changes.