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High-pressure synthesis of Mg2FeH6 complex hydride

✍ Scribed by M. Retuerto; J. Sánchez-Benítez; E. Rodríguez-Cañas; D. Serafini; J.A. Alonso

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
995 KB
Volume
35
Category
Article
ISSN
0360-3199

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✦ Synopsis

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 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 1e2 mm 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.

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ChemInform Abstract: Preparation of the Hydrides Mg2FeH6 and Mg2CoH5 by Mechanical Alloying Followed by Sintering.
✍ J. HUOT; H. HAYAKAWA; E. AKIBA 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 27 KB 👁 1 views

## Preparation of the Hydrides Mg2FeH6 and Mg2CoH5 by Mechanical Alloying Followed by Sintering. -The production of Mg2FeH6 by the title process is significantly enhanced by milling of 2:1 Mg-Fe powder mixtures under H2 atmosphere followed by sintering at 623 K for 1 day under 50 bar H2 pressure.