Abstract
• We report the high pressure Mössbauer studies of C15 Laves RFe 2 (R = Y, Gd) hydrides. • Two-step magnetic transition was found in C15 Laves RFe 2 under high pressure H 2 . • Pressure induced magnetic transition of RFe 2 hydride was not affected by R atom. In situ synchrotron radiation 57 Fe Mössbauer spectroscopy was used to study the C15 Laves phases RFe 2 (R = Y, Gd) under ultra-high-pressure hydrogen in a diamond anvil cell. In both cases, the 57 Fe isomer shift showed a rapid increase at a few GPa, and once again showed a small increase at above P ∼ 10 GPa. The quadrupole splitting also showed stepwise changes. As a marked effect, a two-step magnetic transition was clearly observed for RFe 2 (R = Y, Gd). The results indicate that two different hydride phases appear in the RFe 2 –H reaction system under the hydrogen pressure (up to 34 GPa).
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