High-pressure synthesis of Mg2FeH6 complex hydride

被引：35

作者：

Retuerto, M. ^{[1
]}

Sanchez-Benitez, J. ^{[1
]}

Rodriguez-Canas, E. ^{[2
]}

Serafini, D. ^{[3
,4
]}

Alonso, J. A. ^{[1
]}

机构：

[1] CSIC, Inst Ciencia Mat Madrid, E-28049 Madrid, Spain

[2] Univ Autonoma Madrid, Fac Ciencias, Serv Interdept Invest, E-28049 Madrid, Spain

[3] Univ Santiago Chile, Dept Fis, Fac Ciencias, Santiago, Chile

[4] CIMAT, Ctr Interdisciplinary Res Mat, Santiago, Chile

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 15期

关键词：

Hydrogen storage materials; Mg(2)FeH(6); Mg(2)NiH(4); High-pressure synthesis; Metal hydrides; HYDROGEN STORAGE MATERIAL; COMBUSTION SYNTHESIS; MAGNESIUM; ALLOYS; DECOMPOSITION; KINETICS; MG2COH5; MG2NIH4;

D O I：

10.1016/j.ijhydene.2010.05.062

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：

We have designed a new synthesis method for the ternary metal hydride Mg(2)FeH(6) based on the direct reaction of simple hydrides under high-pressure conditions. Well-crystallized samples were prepared in a piston-cylinder hydrostatic press at 2 GPa and temperatures around 750 degrees C from mixtures of MgH(2) and Fe enclosed in gold or platinum capsules. Seven different samples have been prepared under different conditions. X-ray powder diffraction analysis was used to identify and assess the purity of the samples, through Rietveld analyses of the crystal structure (K(2)PtCl(6)-type). Mg(2)FeH(6) shows a cubic symmetry with space group Fm-3m. SEM images show an average particle size of 1-2 mu m for Mg(2)FeH(6); the microcrystals present well-grown faces and display a high homogeneity of shapes and sizes. Thermogravimetric analysis has been carried out to determine not only the hydrogen desorption temperature but also the hydrogen contents. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

引用

页码：7835 / 7841

页数：7

共 25 条

[1] KINETICS OF THE REACTION BETWEEN MG-NI ALLOYS AND H-2 [J].