Pressure-composition isotherms and thermodynamic properties of TiF3-enhanced Na2LiAlH6

The mixed alanate Na2LiAlH6 was prepared by ball-milling and subsequent heat-treatment under H2 pressure. After the synthesis, 2 mol% TiF3 was added by ball-milling. Pressure-composition isotherms were measured for the Ti-enhanced material in the temperature range of 170-250 deg C. A van't Hoff...

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Veröffentlicht in:Journal of alloys and compounds 2005-07, Vol.397 (1-2), p.135-139
Hauptverfasser: FOSSDAL, A, BRINKS, H. W, FONNELØP, J. E, HAUBACK, B. C
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Sprache:eng
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Zusammenfassung:The mixed alanate Na2LiAlH6 was prepared by ball-milling and subsequent heat-treatment under H2 pressure. After the synthesis, 2 mol% TiF3 was added by ball-milling. Pressure-composition isotherms were measured for the Ti-enhanced material in the temperature range of 170-250 deg C. A van't Hoff plot was constructed using the equilibrium desorption plateau pressures. From this plot, a dissociation enthalpy of 56.4 plus/minus 0.4 kJ/mol H2 and a corresponding entropy of 137.9 plus/minus 0.7 J/K mol H2 was found for Na2LiAlH6.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.01.012