Consequences of helium production from the radioactive decay of tritium on the properties of palladium tritide. Gupta, R. P. & Gupta, M. Physical Review B, 66(1):014105, 2002. 00023 tex.ids= GUPTA2002a, Gupta2002doi abstract bibtex Tritium is an element of considerable interest in the nuclear industry. Since it is radioactive, it needs to be stored in a safe but easily recoverable manner. It is an isotope of H, and hence some of the techniques used for hydrogen storage can be employed, the safest being its storage in the form of a tritide. However, in contrast to the case of hydrogen, tritium decays into \$\{\}{\textasciicircum}\{3\}{\textbackslash}mathrm\{He\}\$ and thus modifies the properties of the tritide. The recoil energy of \$\{\}{\textasciicircum}\{3\}{\textbackslash}mathrm\{He\}\$ in this decay process is very small, \textbackslashensuremath\\textbackslashsim\1.03 eV, and not enough for atomic displacements to occur. We show in this paper, on the basis of our electronic structure calculations, that in the case of PdT, the \$\{\}{\textasciicircum}\{3\}{\textbackslash}mathrm\{He\}\$ produced from the radioactive decay of tritium, although not soluble in the tritide, can be easily retained, in a metastable state, in surprisingly large quantities at the octahedral interstitial sites where it is born. This can explain the expansion of the lattice parameter, the lowering of the plateau pressure, and the fragility of the tritide observed experimentally. We also find that the lowering of the plateau pressure is not entirely due to the lattice expansion as usually assumed and that electronic interactions also play a role.
@article{gupta_consequences_2002,
title = {Consequences of helium production from the radioactive decay of tritium on the properties of palladium tritide},
volume = {66},
doi = {10/drzxcr},
abstract = {Tritium is an element of considerable interest in the nuclear industry. Since it is radioactive, it needs to be stored in a safe but easily recoverable manner. It is an isotope of H, and hence some of the techniques used for hydrogen storage can be employed, the safest being its storage in the form of a tritide. However, in contrast to the case of hydrogen, tritium decays into \$\{\}{\textasciicircum}\{3\}{\textbackslash}mathrm\{He\}\$ and thus modifies the properties of the tritide. The recoil energy of \$\{\}{\textasciicircum}\{3\}{\textbackslash}mathrm\{He\}\$ in this decay process is very small, {\textbackslash}ensuremath\{{\textbackslash}sim\}1.03 eV, and not enough for atomic displacements to occur. We show in this paper, on the basis of our electronic structure calculations, that in the case of PdT, the \$\{\}{\textasciicircum}\{3\}{\textbackslash}mathrm\{He\}\$ produced from the radioactive decay of tritium, although not soluble in the tritide, can be easily retained, in a metastable state, in surprisingly large quantities at the octahedral interstitial sites where it is born. This can explain the expansion of the lattice parameter, the lowering of the plateau pressure, and the fragility of the tritide observed experimentally. We also find that the lowering of the plateau pressure is not entirely due to the lattice expansion as usually assumed and that electronic interactions also play a role.},
number = {1},
journal = {Physical Review B},
author = {Gupta, Raju P. and Gupta, Michèle},
year = {2002},
note = {00023
tex.ids= GUPTA2002a, Gupta2002},
pages = {014105},
}
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