Effect of N, C and B interstitial atoms on local bonding structure in mechanically activated TiH2/h-BN, TiH2/C, and TiH2/B mixtures

Mechanical alloys in the Ti–B–H system: Influence of dispersion and alloying by boron upon thermal stability of hydride phases

“…Further, from these data it is not possible to claim about the possible entering of boron into a content of titanium hydride. Additional information that can be obtained adopting other techniques is necessary for such a task [3]. It is worth to mention that, when heating the mechanical alloys under consideration from room temperature up to 1200 • C, hydrogen was found to release only in the case of the MA1, MA3 and MA4 samples; in the case of the MA2 sample, a release of hydrogen has not been established.…”

“…Small boron additives (9 wt.%) into the initial mixture as well as its dispersion favor decreasing thermal stability of titanium hydride due to insertion (alloying) boron, during milling the mixture, onto TiH 1.9 particle surface and into grainboundary areas. The boron insertion causes weakening the Ti-H bonds in these areas [3,10]. In order to verify the role of boron and titanium borides (e.g., TiB 2 ) in decreasing thermal stability of TiH 1.9 hydride, the MA3 and MA4 materials have been derived.…”

“…However, literature data regarding an application of this method for deriving transition metal hydride derivatives, e.g., binary boron-containing hydrides, are scarce. Elaboration of new methods for a synthesis of such kinds of compounds (e.g., aluminum hydride-based materials) and studies of their physical and chemical properties allow to increase our knowledge regarding a nature of hydrides as well as interstitial alloys [1][2][3]. Titanium-boron hydride Ti(BH 4 ) 3 is known to be a rather prospective hydrogen capacitor (ca.…”

Effect of mechanically induced modification on TiH2 thermal stability

“…Non-equilibrium heating conditions in the temperature programmed desorption (TPD) regime accelerate the metal hydride decomposition procedure. As was shown by the example of TiH 2 , ball-milling with graphite, boron and h-BN additives [5,6] drastically decreases Ti-hydride decomposition temperature in TPD regime due to (1) powder size degradation and (2) appearance of new occupation sites available for H atoms in TiH 2 lattice modified by C, B, and N interstitial atoms, respectively. However, this non-equilibrium metal hydride decomposition is a poorly studied multi-stage process, the single stages of which can be accelerated or retarded by different pretreatment procedures [7].…”

Hydrogen-sorption and thermodynamic characteristics of mechanically grinded TiH1.9 as studied using thermal desorption spectroscopy

“…It should be mentioned that there are a number of investigations, where different techniques were employed to explore effects of ball milling and a nanocrystalline state of TiH 2 , both pure and with different additives, upon some properties of the hydride (e.g., hydrogen mobility, thermal stability, sorption behavior, etc. [18][19][20][21][22][23]), however, to the best of our knowledge, the influence of the grinding of titanium dihydride on its thermodynamic characteristics has not been studied yet.…”