The new hydrides CeNiGeH1.6 and CeCuGeH1.0 crystallizing in the derivative hexagonal ZrBeSi-type structure

被引：22

作者：

Chevalier, B ^{[1
]}

Pasturel, M ^{[1
]}

Bobet, JL ^{[1
]}

Weill, F ^{[1
]}

Decourt, R ^{[1
]}

Etourneau, J ^{[1
]}

机构：

[1] Univ Bordeaux 1, CNRS, UPR 9048, ICMCB, F-33608 Pessac, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2004年 / 177卷 / 03期

关键词：

hydrogenation; cerium compounds; intermediate valence;

D O I：

10.1016/j.jssc.2003.09.003

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The ternary germanides CeNiGe and CeCuGe absorb hydrogen in the temperature range 393-473 K. X-ray powder diffraction and transmission electron microscopy show that the hydride CeNiGeH1.6(1) adopts the hexagonal ZrBeSi-type whereas CeCuGeH1.0(1) crystallizes in a superstructure of this type. Magnetization, electrical resistivity and thermopower measurements reveal that CeNiGeH1.6(1) is an intermediate valence compound having a Kondo temperature congruent to220(10)K smaller than that observed congruent to600(20)K for CeNiGe. On the contrary. a transition from ferromagnetism to non-magnetic ordering above 1.8 K is evidenced during the hydrogenation of CeCuGe. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：752 / 759

页数：8

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