About: Kinetics of phase transformations in Mg2Ni-H system

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en) Byla studována kinetika desorpce vodíku z Mg2NiH4. Experimentální materiál byl připraven dvěma způsoby - tavením a odlitím a kluvým mletím a zkompaktováním do tablet. Experimentální materiály byly nasyceny vodíkem za zvýšených teplot. Tablety byly syceny ve dvou režimech za vzniku struktury s vysokým podílem twin nízkoteplotní fáze LT2 a s nízkým podílem LT2. Bylo vyzkoušeno měření difpzních koeficientů vodíku a jejich teplotní závislost ve vysokoteplotní (HT) and nízkoteplotní (LT) fázi Mg2NiH4. Měření proběhla v teplotním intervalu 449 - 576 K volumetrickou metodou. Bylo zjištěno, že LT2 zpomaluje významně rychlost desoprce. (cs)
Title	Kinetics of phase transformations in Mg2Ni-H system Kinetics of phase transformations in Mg2Ni-H system (en) Kinetika fázových transformací v systému Mg2Ni-H (cs)
skos:prefLabel	Kinetics of phase transformations in Mg2Ni-H system Kinetics of phase transformations in Mg2Ni-H system (en) Kinetika fázových transformací v systému Mg2Ni-H (cs)
skos:notation	RIV/68081723:_____/08:00305517!RIV08-AV0-68081723
http://linked.open.../vavai/riv/strany	71;90
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA106/07/0010), Z(AV0Z20410507)
http://linked.open...iv/cisloPeriodika	-
http://linked.open...vai/riv/dodaniDat	2008
http://linked.open...aciTvurceVysledku	David, Bohumil Stloukal, Ivo Čermák, Jiří Král, Lubomír
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyziky materiálů AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	374783
http://linked.open...ai/riv/idVysledku	RIV/68081723:_____/08:00305517
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	hydrogen storage; hydrogen diffusion; phase transformations (en)
http://linked.open.../riv/klicoveSlovo	phase transformations hydrogen diffusion hydrogen storage
http://linked.open...odStatuVydavatele	CH - Švýcarská konfederace
http://linked.open...ontrolniKodProRIV	[4F3EE1D208CE]
http://linked.open...i/riv/nazevZdroje	Solid State Phenomena
http://linked.open...in/vavai/riv/obor	BJ
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Diffusion of hydrogen in alloys Mg-Ni modified by chosen elements that suppress the stability of hydrides
http://linked.open...UplatneniVysledku	2008
http://linked.open...v/svazekPeriodika	138
http://linked.open...iv/tvurceVysledku	David, Bohumil Král, Lubomír Čermák, Jiří Stloukal, Ivo
http://linked.open...n/vavai/riv/zamer	Physical properties of advanced materials in relation to their microstructure and processing
issn	1012-0394
number of pages	10 (xsd:int)

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