Structural and magnetic properties of the new hydride CeAuAlH1.4(1)

被引：11

作者：

Chevalier, B ^{[1
]}

Bobet, JL ^{[1
]}

Kahn, ML ^{[1
]}

Weill, F ^{[1
]}

Etourneau, J ^{[1
]}

机构：

[1] Univ Bordeaux 1, CNRS, Inst Chim Mat Condensee Bordeux, UPR 9048, F-33608 Pessac, France

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 334卷 / 1-2期

关键词：

rare earth compounds; hydrogen absorbing materials; X-ray diffraction; magnetic measurements;

D O I：

10.1016/S0925-8388(01)01748-0

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：

CeAuAl which orders antiferromagnetically below T-N=3.8 K is considered as a Kondo lattice. This intermetallic absorbs hydrogen at room temperature and at a pressure of 4.5 MPa. The new hydride CeAuAlH1.4(1) is stable in air and crystallises in a derivative structure of the hexagonal Ni2In-type with a=0.4427(1) run and c=0.8467(1) nm as unit cell parameters. Moreover, it exhibits an antiferromagnetic order below T-N = 8.0(2) K and another magnetic transition at T-1 = 3.0(2) K. The strong increase of the T-N-temperature after the insertion of hydrogen in CeAuAl can be explained on the basis of the Doniach diagram; the increase of the unit cell volume induced by this insertion leads to a strong reduction of the influence of the Kondo effect. (C) 2002 Elsevier Science BY All rights reserved.

引用

页码：20 / 26

页数：7

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