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Kinetics of phase transformations in Mg2Ni-H system
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SYSNO ASEP 0305517 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Kinetics of phase transformations in Mg2Ni-H system Title Kinetika fázových transformací v systému Mg2Ni-H Author(s) Čermák, Jiří (UFM-A) RID, ORCID
Král, Lubomír (UFM-A) RID, ORCID
David, Bohumil (UFM-A) RID
Stloukal, Ivo (UFM-A)Source Title Solid State Phenomena - ISSN 1012-0394
Roč. 138, - (2008), s. 71-90Number of pages 10 s. Publication form WWW - WWW Language eng - English Country CH - Switzerland Keywords hydrogen storage ; hydrogen diffusion ; phase transformations Subject RIV BJ - Thermodynamics R&D Projects GA106/07/0010 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z20410507 - UFM-A (2005-2011) Annotation 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. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2008
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