Influence of hydrogen absorption on structural and magnetic properties of Ce2Ni2In

被引：9

作者：

Iwasieczko, Waclaw ^{[1
]}

Kaczorowski, Dariusz ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 507卷 / 02期

关键词：

Cerium intermetallics; Valence fluctuations; Hydrogenation;

D O I：

10.1016/j.jallcom.2010.07.211

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：

Hydrogenation studies were carried out on an intermediate-valence compound Ce2Ni2In. The alloy was found to absorb up to x = 4.98 hydrogen atoms per formula unit at 430 K and at a pressure of 0.3 MPa. The synthesized hydrides were stable in air for a period of few months. The hydrides with x < 2 retain the tetragonal Mo2FeB2-type structure (space group P4/mbm) of the parent compound. For larger hydrogen content a new hydride phase appears with an orthorhombic structure (space group Pbam). Along with the hydrogen uptake in Ce2Ni2InHx there occurs a change in the character of the electronic ground state related to the 4f electrons, from valence fluctuations in the parent compound to rather stable 4f(1) configuration in the hydride with x = 4.98. Furthermore, for x = 2.02 and x = 4.98 long-range antiferromagnetic ordering is observed at low temperatures. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：376 / 379

页数：4

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