Synthesis of amorphous Mg(BH4)(2) from MgB2 and H-2 at room temperature

Summary, in English

Due to its high hydrogen content and its favourable overall thermodynamics magnesium tetrahydroborate has been considered interesting for hydrogen storage applications. In this work we show that unsolvated amorphous magnesium tetrahydroborate can be obtained by reactive ball milling of commercial MgB2 under 100 bar hydrogen atmosphere. The material was characterized by solid-state NMR which showed the characteristic features of Mg(BH4)(2), together with those of higher borohydride species. High pressure DSC and TPD-MS showed thermal behaviour similar to that of Mg(BH4)(2) but with broadened signals. In situ synchrotron X-ray powder diffraction confirmed the amorphous state of the material and showed the typical crystalline decomposition products of Mg(BH4)(2) at elevated temperatures. (C) 2010 Elsevier B.V. All rights reserved.

• Author: Claudio Pistidda; Sebastiano Garroni; Francesco Dolci; Elisa Gil Bardaji; Ashish Khandelwal; Pau Nolis; Martin Dornheim; Rapee Gosalawit; Torben Jensen; Yngve Cerenius; Santiago Surinach; Maria Dolors Baro; Wiebke Lohstroh; Maximilian Fichtner
• Department/s: MAX IV Laboratory
• Publishing year: 2010
• Language: English
• Pages: 212-215
• Publication/Series: Journal of Alloys and Compounds
• Volume: 508
• Issue: 1
• Links: http://dx.doi.org/10.1016/j.jallcom.2010.07.226
• Document type: Journal article
• Publisher: Elsevier
• Topic: Natural Sciences; Physical Sciences
• Keywords: Synchrotron; NMR; Borohydrides; Hydrogen storage; Reactive milling; X-ray diffraction; DSC; TPD
• Status: Published
• ISBN/ISSN/Other: ISSN: 0925-8388