EFFECT OF TITANIUM ON THE PHASE STATE OF LaNi₅-BASED HYDROGEN STORAGE MATERIALS

Hydrogen is a promising source of energy, which requires the development of reliable and efficient methods of its storage. The most promising technology is the storage of hydrogen in intermetallic compounds. This method is one of the safest and allows you to store hydrogen with a higher volume density. In this work, the effect of titanium alloying on the phase and structural composition of LaNi₅-based alloys synthesized by mechanosynthesis and spark plasma sintering is studied. X-ray phase analysis revealed that LaNi₅ is the main matrix phase, and TiNi intermetallic compound is also formed. The oxide phases La₂O₃ and TiO₂, which arose as a result of local oxidation, were found in a number of samples. Optimal crystallinity and phase uniformity characteristics were found in the LNT-1 sample, which confirms the high efficiency of the selected processing conditions. The optimal conditions for obtaining an intermetallic compound based on LaNi₅ doped with titanium are: The ratio of the mass of the balls to the mass of the powder (BPR) is 20:1 for a duration of 8 hours with a rotation speed of 350 rpm and IPS at a pressure of 2 MPa, a temperature of 1300 ℃ and a holding time of 5 minutes. The results obtained allow us to recommend this approach for creating materials with improved characteristics for solid-state hydrogen storage.

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