Competing stabilisation mechanisms in Mg2NiH4

被引：49

作者：

Blomqvist, H

Rönnebro, E

Noréus, D ^{[1
]}

Kuji, T

机构：

[1] Stockholm Univ, Dept Struct Chem, S-10691 Stockholm, Sweden

[2] Osaka Natl Res Inst, Ikeda, Osaka 563, Japan

[3] Mitsui Min & Smelting Co Ltd, Corp R&D Ctr, Ageo, Saitama 3620021, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 330卷

关键词：

Mg2NiH4; alloys; stabilisation mechanisms; metal hydride;

D O I：

10.1016/S0925-8388(01)01637-1

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：

By using three different Mg2Ni alloys to synthesise Mg2NiH4 an additional stabilisation mechanism of this system has been identified. It has been known for some time that the stacking faults at unit cell level in the lattice, microtwinning, stabilise this hydride thermodynamically, but the results in this study also reveal that the addition of free magnesium from the casting of the starting alloys have a similar stabilising effect on the hydride. It is also clear that these two stabilisation mechanisms are connected to each other, i.e. the microtwinning in Mg2NiH4 is dependent not only on the thermal history of the sample but also of the amount of free magnesium added at the casting of the Mg2Ni alloy, The extra magnesium acts as a stabilising dopant to the Mg2NiH4 system and in addition to this gives interesting colour effects of the low-temperature phase of Mg2NiH4. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：268 / 270

页数：3

共 14 条

[1] Synthesis of Mg2Ni alloy by bulk mechanical alloying [J].