Reaction mechanism of hydriding combustion synthesis of Mg2NiH4

被引：62

作者：

Li, LQ

Akiyama, T

Yagi, J

机构：

[1] Tohoku Univ, Inst Adv Mat Proc, Aoba Ku, Sendai, Miyagi 98077, Japan

[2] Miyagi Natl Coll Technol, Sendai, Miyagi 9811239, Japan

来源：

INTERMETALLICS | 1999年 / 7卷 / 06期

关键词：

phase transformation; hydrogen storage; reaction synthesis; intermetallics; miscellaneous;

D O I：

10.1016/S0966-9795(98)00082-X

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：

A previous study suggested that the process of combustion synthesis of Mg2NiH4 from the compact of magnesium and nickel mixture in pressurized hydrogen cannot be expressed by a single reaction formula such as 2Mg + Ni + 2H(2) = Mg2NiH4. In this paper, our attention is addressed to studying the reaction mechanism during the process of hydriding combustion synthesis of Mg2NiH4 by means of a differential scanning calorimeter (DSC) and an X-ray diffractometer (XRD). The results show that this process is consisted of seven distinguished reactions: (1) Mg + H-2-->MgH2; (2) MgH2-->Mg + H-2; (3) 2Mg + Ni-->Mg2Ni; (4) 2Mg + Ni-->Mg2Ni (L); (5) Mg2Ni + 0.15H(2)-->Mg2NiH0.3; (6) Mg2Ni + 2H(2)-->Mg2NiH4 (HT); and (7) Mg2NiH4 (HT)-->Mg2NiH4 (LT). (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：671 / 677

页数：7

共 6 条

[1] Reaction rate of combustion synthesis of an intermetallic compound [J].