Hydride formation in Ce(La)-Ni-Si ternary compounds

被引：6

作者：

Lushnikov, SA ^{[1
]}

Klyamkin, SN ^{[1
]}

Morozkin, AV ^{[1
]}

Verbetsky, VN ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119899, Russia

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 293卷

关键词：

cerium-nickel-silicon compounds; hydride; crystal structure;

D O I：

10.1016/S0925-8388(99)00473-9

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：

Hydrogen interaction with R2Ni0.8Si1.2, R2NiSi, R2Ni1.2Si0.8 and R6Ni2Si3 (R=La, Ce) compounds were studied. The new hydride phases, namely, La2Ni0.8Si1.2H3.75, La2NiSiH3.9, La2Ni1.2Si0.8H4.4, Ce2Ni0.8Si1.2H3.7, Ce2NiSiH4.4, Ce2Ni1.2Si0.8H4.9, La6Ni2Si3H12 and Ce6Ni2Si3H10.9 have been synthesised and characterised by X-ray diffraction and thermodesorption methods. All hydrides retained the structure type of the starting compounds with pronounced anisotropic distortion of crystal lattice: the increase of the <<a>>, parameter at decreasing <<c>>. Variation of the Ni/Si ratio in R2Ni1-xSi1+x (x=0, 0.4 and -0.4) markedly affected the hydrogen capacity and crystal lattice extension. The Ce-containing hydrides possessed a higher hydrogen contents but significantly smaller specific unit cell volume expansion per one hydrogen atom in comparison with La-based compounds. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：429 / 432

页数：4