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Amorphous Al1-xTix, Al1-xVx, and Al1-xFex phases in the hydrogen cycled TiCl3, VCl3 and FeCl3 enhanced NaAlH4 systems

Abstract

The twice hydrogen (H) cycled planetary milled (PM) and cryo milled (CM) NaAlH4 + xTMCl3 (transition metal (TM) = Ti, V, Fe) systems (x > 0.1) have been studied by high resolution synchrotron X-ray diffraction, and high resolution transmission electron microscopy (TEM). Intense primary amorphous (a-) Al1−xTMx halos are evident in diffraction data of PM samples for V and Fe, and in CM samples for Ti, V, and Fe. Weaker primary amorphous Al1−xTix halos are evident in PM samples for Ti. The Ti poor a-Al1−xTix phase observed for NaAlH4 + xTiCl3 (x > 0.1) ranges in composition from a-Al86.5Ti13.5 → a-Al92Ti8. High resolution TEM studies of the Al1−xVx phases in the H cycled PM NaAlH4 + 0.1VCl3 system demonstrates that a nanoscopic composite morphology can exist between face centred cubic (fcc) crystalline (c-) Al1−xVx and a-Al1−xVx phases, with the c-Al1−xVx/a-Al1−xVx composite embedded on the NaAlH4 surface. The amorphous Al1−xVx reaches ca. 28 at.%V.

Category

Academic article

Language

English

Author(s)

  • Mark Pitt
  • Per Erik Vullum
  • Magnus Helgerud Sørby
  • H. Emerich
  • Mark Paskevicius
  • Craig E. Buckley
  • Evan MacA. Gray
  • John Walmsley
  • Randi Holmestad
  • Bjørn Hauback

Affiliation

  • Institute for Energy Technology
  • Curtin University
  • Griffith University
  • Norwegian University of Science and Technology
  • European Synchrotron Radiation Facility
  • SINTEF Industry / Materials and Nanotechnology

Year

2012

Published in

Journal of Alloys and Compounds

ISSN

0925-8388

Publisher

Elsevier

Volume

521

Page(s)

112 - 120

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