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Effect of Helium on the Electronic Structure of Palladium Tritide

  • R. P. Gupta (a1) and M. Gupta (a2)

Abstract

Tritium is usually stored in the form of a metal tritide since it is safe to handle in this form, easily recoverable, and further large quantities of tritium can be stored. However, since tritium is radioactive it decays into 3He and an electron. Helium recoil energy in this reaction is very small, and not enough to create defects. We have performed ab-initio electronic structure calculations that show that in PdT, a considerable amount of 3He can be accommodated at the 3He results in an overall enhancement in the strength of the metal- tritium bonding that leads to the lowering of the plateau pressure. We also find that there is a weakening of the metal-metal bonds due to the repulsive interaction with 3He.

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1. Lüisser, R., Tritium and Helium-3 in Metals, Springer-Verlag, Berlin (1989).
2. Bowman, R. C. Jr., and Attalla, A., Phys. Rev. B 16, 1828 (1977).
3. Beavis, L. C. and Kass, W. J., J. Vac. Sci. Tech. 14, 509 (1977).
4. Lundin, C. E., Lynch, F. E. and Magee, C. B., J. Less-Comm Metals 56, 19 (1977).
5. Spulak, R. G. Jr., J. Less-Comm Metals 132, L17 (1987).

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Effect of Helium on the Electronic Structure of Palladium Tritide

  • R. P. Gupta (a1) and M. Gupta (a2)

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