Structural and dehydriding properties of Ca(BH4)2

We have investigated the structural and dehydriding properties of Ca(BH 4 ) 2 . It was found that Ca(BH 4 ) 2 undergoes a structural phase transformation from an orthorhombic low-temperature (LT) modification into a tetragonal high-temperature (HT) modification between 433 K and 523 K. The amount of...

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Veröffentlicht in:	Applied physics. A, Materials science & processing Materials science & processing, 2008-08, Vol.92 (3), p.601-605
Hauptverfasser:	Aoki, M., Miwa, K., Noritake, T., Ohba, N., Matsumoto, M., Li, H.-W., Nakamori, Y., Towata, S., Orimo, S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alternative fuels. Production and utilization Applied sciences Characterization and Evaluation of Materials Condensed Matter Physics Condensed matter: structure, mechanical and thermal properties Energy Equations of state, phase equilibria, and phase transitions Exact sciences and technology Fuels Hydrogen Machines Manufacturing Nanotechnology Optical and Electronic Materials Physics Physics and Astronomy Processes Solid-solid transitions Specific phase transitions Surfaces and Interfaces Thin Films
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Zusammenfassung:	We have investigated the structural and dehydriding properties of Ca(BH 4 ) 2 . It was found that Ca(BH 4 ) 2 undergoes a structural phase transformation from an orthorhombic low-temperature (LT) modification into a tetragonal high-temperature (HT) modification between 433 K and 523 K. The amount of hydrogen desorbed from Ca(BH 4 ) 2 during the pressure–composition ( p – c ) isotherm measurement was 5.9 mass%. This hydrogen desorption is caused by the partial dehydrogenation of Ca(BH 4 ) 2 accompanied by the formation of CaH 2 and orthorhombic intermediate phases.
ISSN:	0947-8396 1432-0630
DOI:	10.1007/s00339-008-4548-5