In situ synchrotron 57Fe Mossbauer spectroscopy of RFe2 (R = Y, Gd) hydrides synthesized under ultra-high-pressure hydrogen

被引：9

作者：

Mitsui, T. ^{[1
]}

Masuda, R. ^{[2
]}

Seto, M. ^{[2
]}

Hirao, N. ^{[3
]}

Matsuoka, T. ^{[4
]}

Nakamura, Y. ^{[5
]}

Sakaki, K. ^{[5
]}

Enoki, H. ^{[5
]}

机构：

[1] Japan Atom Energy Agcy, Sayo, Hyogo 6795148, Japan

[2] Kyoto Univ, Kumatori, Osaka 5900494, Japan

[3] JASRI, SPring 8, Sayo, Hyogo 6795198, Japan

[4] Osaka Univ, Toyonaka, Osaka 5608531, Japan

[5] AIST, ETRI, Tsukuba, Ibaraki 3058565, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 580卷

基金：

日本学术振兴会;

关键词：

Hydrogen absorbing materials; Metal hydrides; High-pressure; Phase transitions; Hyperfine interactions; Mossbauer spectroscopy; MAGNETIC-PROPERTIES; LAVES PHASES; DEUTERIDES;

D O I：

10.1016/j.jallcom.2013.03.271

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In situ synchrotron radiation Fe-57 Mossbauer 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 Fe-57 isomer shift showed a rapid increase at a few GPa, and once again showed a small increase at above P similar to 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). (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：S264 / S267

页数：4

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