Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 80, Issue 7, Pages 1409-1412Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-004-3194-9
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It was revealed that LiBH4 is destabilized by mixing with LiNH2 and the mixture desorbs a large amount of hydrogen. First-principles calculations predicted that the enthalpies of dehydrogenation for LiBH4 alone and the mixture of LiBH4 + 2LiNH(2) are 75 kJ/ molH(2) and 23 kJ/ molH(2), respectively. Motivated by this prediction, we experimentally examined the dehydrogenation properties for LiBH4 and the mixture under hydrogen pressure. The amounts of desorbed hydrogen from LiBH4 and the mixture at 703 K and 522 K were 10.6 mass% and 7.8 mass%, respectively. The dehydrogenation pressure of the mixture was much higher than that of LiBH4 alone, although the mixture was measured at approximately 180 K lower temperature. This result suggests that the mixture is much unstable as compared with LiBH4 alone.
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