In-situ synchrotron 57Fe Mössbauer spectroscopy of RFe2 (R=Y, Gd) hydrides synthesized under ultra-high hydrogen pressure
In-situ synchrotron 57Fe Mössbauer spectroscopy of RFe2 (R=Y, Gd) hydrides synthesized under ultra-high hydrogen pressure
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超高氢压下合成的 RFe2 (R=Y, Gd) 氢化物的原位同步加速器 57Fe 穆斯堡尔谱
DOI：
10.1016/j.jallcom.2013.03.271
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发表时间：
2013
影响因子：
6.2
通讯作者：
K. Sakaki
中科院分区：
文献类型：
--
作者：
T. Mitsui;R. Masuda;M. Seto;N. Hirao;T. Matsuoka;Y. Nakamura;K. Sakaki
在金刚石对顶砧装置中，利用同步辐射穆斯堡尔谱原位研究了超高压氢气氛下C15 Laves相RFe 2（R = Y，Gd）的结构。在这两种情况下，57 Fe异构体位移在几个GPa时迅速增加，在超过P10 GPa时又有一个小的增加。四极分裂也呈阶梯状变化。作为一个显着的效果，一个两步磁转变，清楚地观察到RFe 2（R = Y，Gd）。结果表明，在氢气压力（34 GPa）下，RFe 2-H反应体系中出现了两种不同的氢化物相。
In situ synchrotron radiation57Fe 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, the57Fe isomer shift showed a rapid increase at a few GPa, and once again showed a small increase at aboveP∼ 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).