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High pressure study of NaAlH4 by Raman spectroscopy up to 17 GPa
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
2006 (English)In: High Pressure Research, ISSN 0895-7959, Vol. 26, no 3, 165-73 p.Article in journal (Refereed) Published
Abstract [en]

A high-pressure Raman study was carried out on NaA1H(4) up to 17 GPa using the diamond anvil cell method. In the pressure region 2-5 GPa, several of the original modes split. Although this might be a sign of some structural change, the spectral changes do not allow us to claim the existence of a clear phase transition in this pressure range. The spectra revert to their ambient pressure forms on decreasing pressure below < 3.0-1.4 GPa. A phase transition to beta-NaA1H(4) was found at 14-16 GPa. This phase transition is also reversible with an unusually strong hysteresis: the beta-NaA1H(4) can be followed upon decompression down to 3.9 GPa. Analysis of Raman data shows that this phase transition is compatible with a theoretical prediction of a strong volume collapse.

Place, publisher, year, edition, pages
2006. Vol. 26, no 3, 165-73 p.
Keyword [en]
Hydrogen storage, hydrides, high pressure, phase transition, Raman scattering, NaAlH4, hysteresis
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-12174DOI: doi:10.1080/08957950600742425OAI: oai:DiVA.org:umu-12174DiVA: diva2:151845
Available from: 2007-11-28 Created: 2007-11-28 Last updated: 2011-01-11Bibliographically approved

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