Nanocrystalline alanates—Phase transformations, and catalysts

Synchrotron X-ray diffraction and X-ray photoelectron spectroscopy studies of NaAlH4 containing Ti–Zr hydride additives

“…Ti 2 O 3 maybe formed during the ball-milling and dehydrogenation. The valence state of most of the Ti was zero after ball milling, and remained so during the desorption and absorption of hydrogen, in agreement with the previous literature [22,23]. It is worth noting that the zero-valence state Ti can be divided into two parts, Ti 3p and 3s.…”

Chemical state of Ti in sodium alanate doped with TiCl3 using X-ray photoelectron spectroscopy

“…3b, shows a behaviour which depends on the milling time of the sample: an initial increase can be observed with the (bm2) sample which is followed by a subsequent decrease whereas a steady increase can be observed with the (bm60) sample. This is in accordance with SNMS depth profiles, which were obtained with similarly prepared samples [7]. The atomic concentration obtained after sputtering, Table 1, indicates that the amount of Ti, Cl and Al is increasing while the amount of Na and oxygen is decreasing.…”

Effect of Ti-doping on the dehydrogenation kinetic parameters of lithium aluminum hydride

“…The fact that the color of the sample ball milled for 1 min at 100 rpm did not change i.e. no darkening due to finely dispersed Ti and Al particles, may indicate that Ti is incorporated into the LiAlH 4 as suggested by Fichtner et al [22]. However, this work is not conclusive about the chemical state of Ti in LiAlH 4 .…”