Long-Term Behavior of the Tritides Formed by Nickel-Based Intermetallic Compounds

R. C. Bowman, Jr.a; R. H. Steinmeyer; L. K. Matson; A. Attalla; B. D. Craft

doi:dx.doi.org/10.13182/FST85-A24628

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Long-Term Behavior of the Tritides Formed by Nickel-Based Intermetallic Compounds

R. C. Bowman, Jr.a, R. H. Steinmeyer, L. K. Matson, A. Attalla, B. D. Craft

Fusion Science and Technology / Volume 8 / Number 2P2 / September 1985 / Pages 2337-2343

Material Interaction / Proceedings of the Second National Topical Meeting on Tritium Technology in Fission, Fusion and Isotopic Applications (Dayton, Ohio, April 30 to May 2, 1985) / dx.doi.org/10.13182/FST85-A24628

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Some properties of the tritide phases formed by the intermetallic compounds Mg₂Ni, ZrNi, and LaNi₅ have been studied. Whereas ZrNiT₃ will retain its stoichiometry indefinitely when sufficient gaseous tritium is available, the stoichiometrics of Mg₂NiT₄ and LaNi₅T_6.9 decrease with time. Although all three intermetallic tritides can retain large quantities of the helium-3 tritium decay daughter product in the solid phase, irreversible release of helium begins after several hundred days for ZrNiT_x and Mg₂NiT_x. However, LaNi₅T_x retains all of the helium generated in the solid for at least 2400 days. NMR measurements for ZrNiT_x and Mg₂NiT_x imply that helium is retained in microscopic bubbles as previously observed in several binary metal tritides.