Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803612 | Journal of Alloys and Compounds | 2005 | 9 Pages |
Abstract
In this paper an investigation has been made on the effects of vacuum annealing treatment at 1000 °C for 100 h on the hydrogen storage capacity of Mm, Ti and Cr substituted Zr1â2xMmxTixFe1.4Cr0.6 (x = 0.03, 0.05, 0.07, 0.09) Laves phase alloys. XRD patterns show that annealing has no significant effect on the structure of the alloy. However, the crystal lattice strain and defects decreased and grain size increased for all compositions studied after annealing. These materials exhibit high uptake of hydrogen as compared to those by the as-synthesized alloy. The optimum alloy corresponds to the composition Zr0.9Mm0.05Ti0.05Fe1.4Cr0.6. It shows a storage capacity of â¼1.94 wt.% and kinetics of â¼5.83 Ã 10â4 m3/s/kg. This is one of the highest storage capacity reported for any ZrFe2 type alloy. The unit cell volumes have been found to correlate with storage capacity. The P-C isotherms at various temperatures have been simulated by a suitable mathematical model. For this, the randomized variables ÎH and ÎS have been evaluated experimentally. These have been used as input parameters for simulation. The simulated and experimental curves have been found to match closely.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Sudipta Roy, B.K. Singh, M.V. Lototsky, O.N. Srivastava,