Add time:09/03/2019         Source:sciencedirect.com

Intermetallic compounds Tb7Rh3 and Dy7Rh3, which crystallize in Th7Fe3 type hexagonal structure with the space group P63mc were hydrogenated under high hydrogen pressure in order to study influence of hydrogen on their structural and magnetic properties.Hydrogen treatment of Tb7Rh3 and Dy7Rh3 even at moderate pressures resulted in formation of hydrides with H/M > 2. The hydrides retained symmetry of parent materials but large lattice expansion has been observed. After release of hydrogen pressure the hydrides were stable and could be kept for long time at normal conditions. Hydrogenation affects strongly magnetic properties of both Tb7Rh3 and Dy7Rh3. Treatment at 100 °C up to 10 kbar (H2) did not cause their amorphisation or decomposition.

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