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. 28at.% V.
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