Enhancement of hydrogen diffusion in the body-centered tetragonal monohydride phase of the V–H system by substitutional Al studied by proton nuclear magnetic resonance

Cost reduction possibilities of vanadium-based solid solutions – Microstructural, thermodynamic, cyclic and environmental effects of ferrovanadium substitution

“…The observation that the capacity of the monohydride is less affected by impurities than the capacity of dihydride suggests that the impurity effect is more pronounced for those interstitial sites filled by hydrogen atoms during the formation of the dihydride. Site occupation of hydrogen atoms in the monohydride phase of BCC solid solutions has been shown to depend strongly on alloy composition, and shifts from occupation of O z sites to occupation of T sites after substituting V with elements such as Cr or Al [20,21]. Both elements are also present in the alloys studied in this work.…”

“…This suggests that H atoms occupied the T sites in that state [21]. The cubic lattice was distorted considerably after 50 cycles.…”

Hydrogen absorption and desorption in the V–Al–H system

“…Asano et al 34 found the crystal lattice of β-V 2 H to expand, when substitutional Al is present. Based on their work, the c / a ratio can be used as an indicator for the amount of dissolved Al.…”

“…According to the X-ray diffraction patterns, no stable vanadium aluminium hydride phase like V 3 Al 2 H 1.8-2.2 11 is formed in the hydrogenation experiments. Asano et al 34 found the crystal lattice of β-V 2 H to expand, when substitutional Al is present. Based on their work, the c/a ratio can be used as an indicator for the amount of dissolved Al.…”

Hydrogenation Thermodynamics of Ti16V60Cr24−xFex Alloys (x = 0, 4, 8, 12, 16, 20, 24)

“…Consequently, the reversible hydrogen capacity is reduced by approximately half in vanadium metal, which is not sufficient for practical applications [20]. This issue has been partially resolved by adding alloying elements [21][22][23][24][25][26][27][28][29]. For example, Aoki et al have reported that in the system Ti 12 Cr 23 V 65 , when V is substituted with Fe, the cyclability is improved: Ti 12 Cr 23 V 64 Fe 1 released 97% of its initial capacity, while the Fe-free alloy only desorbed 88% [30].…”