Original title: Changes of Phase Composition of NaAlH4 Based Complex Hydrides
Authors: Roupcová, Pavla ; Schneeweiss, Oldřich
Document type: Papers
Conference/Event: NANOCON 2011. International Conference /3./, Brno (CZ), 2011-09-21 / 2011-09-23
Year: 2011
Language: eng
Abstract: The Mössbauer study is target to valence of Fe-doped phase and its changes during preparation by mixing with NaAlH4 and charging and discharging cycles. The 2 mol % FeCl2·4H2O powder was contained in the asmixing material. The dry milled sample did not transformed during the milling in the protective atmosphere. The significant change was approved in the firstly hydrogenation step only. The analysis shows FeClO which released the most significant component in the dehydrogenation and hydrogenation steps. The amount of FeClO was decreased with the all following step of hydrogenation and dehydrogenation. The fine paramagnetic particles of iron oxides were detected and their amount increased influenced of gas impurities. The longer period of heat treatment shows the agglomeration of iron oxides and their magnetic effect.
Keywords: hydrogen absorbing materials; Mössbauer spectroscopy
Project no.: CEZ:AV0Z20410507 (CEP), 1M0512 (CEP), ED1.1.00/02.0068, GP106/09/P556 (CEP)
Funding provider: GA MŠk, GA MŠk, GA ČR
Host item entry: NANOCON 2011. Conference Proceedings, ISBN 978-80-87294-23-9

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0207366

Permalink: http://www.nusl.cz/ntk/nusl-109893


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