Structural, electronic and magnetic properties of YFeMnH5

被引：3

作者：

Drozd, V. ^{[1
,2
]}

Kuo, H. T. ^{[1
]}

Bagkar, N. ^{[1
]}

Mylswamy, S. ^{[1
]}

Liu, R. S. ^{[1
]}

Paul-Boncour, V. ^{[3
]}

Marchuk, I. ^{[4
]}

Filipek, S. M. ^{[4
]}

Chou, C. C. ^{[5
]}

Sun, C. P. ^{[5
]}

Yang, H. D. ^{[5
]}

Chen, J. M. ^{[6
]}

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan

[2] Florida Int Univ, Ctr Study Matter Extreme Condit, Miami, FL 33199 USA

[3] ISCSA, CNRS, Lab Chem Met Rare Earths, F-94320 Thiais, France

[4] Polish Acad Sci, Inst Phys Chem, Warsaw, Poland

[5] Natl Sun Yat Sen Univ, Dept Phys, Kaohsiung 804, Taiwan

[6] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2011年 / 36卷 / 01期

关键词：

Laves phases; Hydrides; XANES; Magnetization; INTERMETALLIC COMPOUNDS; MOSSBAUER-SPECTROSCOPY; NEUTRON-DIFFRACTION; LAVES HYDRIDES; X-RAY; HYDROGEN; ORDER; PRESSURE; YMN2; ABSORPTION;

D O I：

10.1016/j.ijhydene.2010.09.010

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：

YFeMn alloy exposed to high hydrogen pressure transforms into hydrides with hydrogen concentration higher than 5 H p.f.u. Rietveld's refinement of XRD data indicates the presence of two hydrides corresponding to YFeMnH5.46 and YFeMnH5.02 with the cubic structure of a parent intermetallics. YFeMnH5.46 was found to be unstable. It desorbs hydrogen yielding YFeMnH5.02 (referred as YFeMnH5) which was used for further X-ray absorption near edge structure (XCANES) and magnetic measurements. Based on XANES studies at the Mn and Fe Kedges, Mn and Fe atoms in YFeMn alloy are in the metallic state, whereas they exhibit partially anionic character in the hydride. Hydrogenation influences the valence state of Mn and Fe in YFeMn, modifies the density of states (DOS) near the Fermi level and induces an increase of the Curie temperature and a decrease of magnetization at 5 K. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

引用

页码：1046 / 1052

页数：7

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