Abstract
Abstract The pressure-composition isotherm for the RCo3-H2 system (R = heavy rare earth) shows two plateau pressures. For GdCo3 the first plateau extends to the approximate composition GdCo3H2.2 (designated as β-hydride) and the second to the composition GdCo3H4.6 (γ-hydride). Magnetization measurements have been carried out on GdCo3, GdCo3H2, GdCo3H4.6, DyCo3, DyCo3H4.3, HoCo3 and HoCo3H4.2 in the temperature range 4.2 K to 300 K. The results show that hydrogen absorption produces a reduction both in the magnetic moment per cobalt and the Curie temperature; the reduction is slight in going from GdCo3 to GdCo3H2.2, but is drastic in going to GdCo3H4.6. In contrast, in isostructural GdFe3 compound, the magnetic moment per iron increases on hydrogen absorption. Measurements on DyCo3H4.3 and HoCo3H4.2 suggest the possibility that the rare earth moments are not magnetically ordered even at 4.2 K.
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