A systematic study of the structural and intrinsic magnetic properties of the hydrides (R = Y, Ce, Nd, Sm, Gd, Tb, and Dy) has been performed. Hydrogenation leads to a relative volume expansion of the unit cell and a decrease in x-ray density for each compound. Anisotropic expansions mainly along the a- and b-axes rather than along the c-axis for all of the compounds upon hydrogenation are observed. The lattice constants and the unit-cell volume of and decrease with increasing R atomic number from Nd to Dy, except for Ce, reflecting the lanthanide contraction. Hydrogenation results in an increase in the Curie temperature and a corresponding increase in the saturation magnetization at room temperature for each compound. After hydrogenation a decrease of in the average Fe atomic magnetic moment and a slight increase in the anisotropy field for are achieved at 4.2 K. First-order magnetization processes (FOMP) occur in magnetic fields of around 1.5 T and 4.0 T at 4.2 K for and , and around 1.4 T at room temperature for . The abnormal crystallographic and magnetic properties of and suggest that the Ce ion is non-triply ionized.
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