Abstract
Thermodynamically stable Ti 3Ir with the Cr 3Si (A15)-type crystal structure can gradually be transformed into a metastable Ti 3Ir alloy with a bcc crystal structure by high-energy ball-milling for 12.5 h. The long-term ball-milling for up to 112 h, however, is accompanied by a solid-state reaction between Ti 3Ir and the vial material leading to the formation of a nano-crystalline or amorphous MgZn 2-type phase with the Ti(Fe 1.85Ir 0.15) stoichiometry and a micro-crystalline thermodynamically stable CsCl-type phase. Both the CsCl- and MgZn 2-type phases were obtained in the crystalline form after annealing ball-milled Ti 3Ir. Properties of the A15 Ti 3Ir alloy changed considerably after ball-milling. The superconducting transition observed in the original A15 alloy at ∼4.3 K no longer exists in the ball-milled material. The electrochemically determined hydrogen storage capacity of the ball-milled alloy also decreases in comparison to the A15 material from 269 to 104 mAh/g. On the contrary, the electrochemical discharge capacity of Ti 3Ir increases from 45 to 104 mAh/g after ball-milling.
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