Intermediate phases observed during decomposition of LiBH4

Summary, in English

Lithium tetrahydridoboranate is among the materials with the highest hydrogen content and has great potential as a possible H-2-storage material, although, the release and uptake of H-2 is not fully understood. In this work, LiBH4 was studied by in situ synchrotron radiation powder X-ray diffraction (PXD) and solid state CP/MAS NNIR both at variable temperatures. This study revealed two new phases observed during dehydrogenation of LiBH4. Phase I is hexagonal, a = 4.93(2) and c = 13.47(3) angstrom and is observed in the temperature range -200-300 degrees C, and phase II is orthorhombic, a = 8.70(1), b = 5.44(1) and c = 4.44](8) angstrom and is observed in the temperature range similar to 300-400 degrees C applying a constant heating rate of 5 degrees C/min. Apparently, I transforms into II, e.g. at a constant temperature of T= 265 degrees C after 5 h. Furthermore, a third phase, III, is observed in the temperature range RT to 70 degrees C, and is caused by a reaction between LiBH4 and water vapor from the atmosphere. Hydrogen release is associated with the decomposition of III at ca. 65 degrees C. (C) 2007 Elsevier B.V. All rights reserved.

• Author: Lene Mosegaard; Bitten Møller; Jens-Erik Jørgensen; Ulrike Bösenberg; Martin Dornheim; Jonathan C Hanson; Yngve Cerenius; Gavin Walker; Hans Jørgen Jakobsen; Flemming Besenbacher; Torben R Jensen
• Department/s: MAX IV Laboratory
• Publishing year: 2007
• Language: English
• Pages: 301-305
• Publication/Series: Journal of Alloys and Compounds
• Volume: 446-447
• Links: http://dx.doi.org/10.1016/jjailcom.2007.03.057
• Document type: Conference paper
• Publisher: Elsevier
• Topic: Physical Sciences; Natural Sciences
• Conference name: 10th International Symposium on Metal-Hydrogen Systems, Fundamentals and Applications
• Conference date: 2006-10-01 - 2006-10-06
• Conference place: Lahaina, HI, United States
• Status: Published
• ISBN/ISSN/Other: ISSN: 0925-8388