کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1613415 | 1005597 | 2013 | 4 صفحه PDF | دانلود رایگان |
• We report the high pressure Mössbauer studies of C15 Laves RFe2 (R = Y, Gd) hydrides.
• Two-step magnetic transition was found in C15 Laves RFe2 under high pressure H2.
• Pressure induced magnetic transition of RFe2 hydride was not affected by R atom.
In situ synchrotron radiation 57Fe Mössbauer spectroscopy was used to study the C15 Laves phases RFe2 (R = Y, Gd) under ultra-high-pressure hydrogen in a diamond anvil cell. In both cases, the 57Fe 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 RFe2 (R = Y, Gd). The results indicate that two different hydride phases appear in the RFe2–H reaction system under the hydrogen pressure (up to 34 GPa).
Journal: Journal of Alloys and Compounds - Volume 580, Supplement 1, 15 December 2013, Pages S264–S267