Structural properties of the nanoscopic Al85Ti15 solid solution observed in the hydrogen-cycled NaAlH4 + 0.1TiCl3 system

Structural properties of the nanoscopic Al85Ti15 solid solution observed in the hydrogen-cycled NaAlH4 + 0.1TiCl3 system

The twice-hydrogen-cycled NaAlH4 + xTiCl3 (x < 0.15) system has been studied by high-resolution X-ray synchrotron diffraction and transmission electron microscopy. Intense low d-spacing shoulders are formed on Al reflections, indicating the formation of a face-centred cubic Al85Ti15 solid solutio...

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Veröffentlicht in:Acta materialia 2008-10, Vol.56 (17), p.4691-4701
Hauptverfasser: PITT, M. P, VULLUM, P. E, SØRBY, M. H, SULIC, M. P, JENSEN, C. M, WALMSLEY, J. C, HOLMESTAD, R, HAUBACK, B. C
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Exact sciences and technology
Metals. Metallurgy
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container_end_page 4701
container_issue 17
container_start_page 4691
container_title Acta materialia
container_volume 56
creator PITT, M. P
VULLUM, P. E
SØRBY, M. H
SULIC, M. P
JENSEN, C. M
WALMSLEY, J. C
HOLMESTAD, R
HAUBACK, B. C
description The twice-hydrogen-cycled NaAlH4 + xTiCl3 (x < 0.15) system has been studied by high-resolution X-ray synchrotron diffraction and transmission electron microscopy. Intense low d-spacing shoulders are formed on Al reflections, indicating the formation of a face-centred cubic Al85Ti15 solid solution of unit cell dimension 4.0356 A. The Al85Ti15 solid solution is found as isolated 4-25 nm nanocrystallites on the NaAlH4 surface. The Al85Ti15 phase is highly 1 1 0{1 1 1} edge dislocated to 6 X 1016 m-2. Local energy-dispersive spectroscopy shows an Al:Ti ratio consistent with an Al85Ti15 composition, confirming an extended solubility of Ti in Al. Structural analysis indicates a quenched L12 superlattice obtained by Al and Ti sublattice swapping, yielding an equivalent A1 model to describe the Al85Ti15 crystal structure.
doi_str_mv 10.1016/j.actamat.2008.05.037
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title Structural properties of the nanoscopic Al85Ti15 solid solution observed in the hydrogen-cycled NaAlH4 + 0.1TiCl3 system
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