Paper Title:
Kinetics of Phase Transformations in Mg2Ni-H System
  Abstract

Kinetics of hydrogen desorption from Mg2NiH4 was studied. Experimental material was prepared by two techniques – by melting and casting and by ball-milling and compacting into pellets. Experimental materials were hydrogen charged at elevated temperature and pressure. The pellets were charged in two different regimes resulting in structures with high fraction of twinned low-temperature phase LT2 and with low fraction of LT2. It was made an attempt to measure diffusion coefficients of hydrogen and its temperature dependence both in high-temperature (HT) and in low-temperature (LT) phases of Mg2NiH4. The measurement was carried out in temperature interval from 449 K to 576 K by the volumetric method. It was found that the LT2 slows-down the desorption rate considerably.

  Info
Periodical
Solid State Phenomena (Volume 138)
Edited by
J. Čermák and I. Stloukal
Pages
71-90
DOI
10.4028/www.scientific.net/SSP.138.71
Citation
J. Čermák, L. Král, B. David, I. Stloukal, "Kinetics of Phase Transformations in Mg2Ni-H System ", Solid State Phenomena, Vol. 138, pp. 71-90, 2008
Online since
March 2008
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