XAFS Study of the Al K-Edge in NaAlH4
Publication date
2007
Authors
Baldé, Cornelius Peter
Mijovilovich, A.E.
Koningsberger, Diederik C.
van der Eerden, Ad
Smith, A.D.
de Jong, Krijn
Bitter, Harry
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Abstract
Al K-edge (1561.1 eV) XANES and EXAFS spectra of unoxidized NaAlH4, a hydrogen storage material, have been recorded in He atmosphere in a special in situ low-energy cell. The XANES spectrum of NaAlH4 is reported and compared to that of oxidized NaAlH4, thus illustrating the power of XANES spectroscopy as a quick qualitative check of the NaAlH4. For the EXAFS data, reliable fits of the Al K-edge spectra could be obtained when all scattering contributions, i.e., Al-H, Al-Na, and Al-Al, were incorporated into the fit. The hydrogen atoms made a significant contribution to the Al K-edge EXAFS signal of NaAlH4, which stresses the importance of hydrogen scattering when analyzing EXAFS data of this metal hydride.
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Balde, C P, Mijovilovich, A E, Koningsberger, D C, van der Eerden, A M J, Smith, A D, de Jong, K P & Bitter, J H 2007, 'XAFS Study of the Al K-Edge in NaAlH4', Journal of Physical Chemistry C, vol. 111, no. 31, pp. 11721-11725.