Cyclic stability of the C36-type TiCr2 Laves phase synthesized in the abnormal glow discharge plasma under hydrogenation. (8th March 2019)

• Record Type: Journal Article
• Authors: Murashkina, T.L.; Syrtanov, M.S.; Laptev, R.S.; Lider, A.M.
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 13(2019)
• Page Start: 6709
• Page End: 6719
• Publication Date: 2019-03-08
• Subjects: Laves phase -- Hydrogen storage -- Glow discharge -- TiCr alloys -- Hydrogenation -- Thermal desorption spectroscopy; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.01.150
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In this work, the cyclic stability of the C36-type TiCr2 Laves phase synthesized in the abnormal glow discharge plasma was investigated. Melting of titanium-chromium metallic powders by the glow discharge plasma leads to the formation of the TiCr2 hexagonal C36 Laves phase with lattice parameters a = 4.928 Å and c = 15.983 Å. The hydrogenation-dehydrogenation method was used for crushing to increase the effective sorption capacity of the C36-type TiCr2 Laves phase. The stable hydride TiCr2 Hx (x ≤ 0.5) phase of structural polytype C36 is formed during the first absorption/desorption cycle at the temperature of 30 °C. After 15 cycles hydride with the stoichiometric composition close to the TiCr2 H0.5 phase of C36 polytype with lattice parameters: a = 4.961 Å and c = 16.224 Å was observed by XRD analysis. The hydrogen is localized in the crystal lattice in three main states: in a solid solution trapped by defects, open volume defects, and in the form of hydrides. Highlights: The C36-type TiCr2 Laves phase alloy is synthesized by the glow discharge method. Significant decrease of maximum hydrogen capacity at the second cycle absorption is observed. Stable TiCr2 H0.5 phase of C36-type formed after 15 cycles absorption/desorption. The H atoms are localized as a solid solution, trapped by defects, as hydride form.