Some properties of the tritide phases formed by the intermetallic compounds Kg.Ni, ZrNi, and

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The distribution of helium ( He) created in uranium tritide {UT3) by triton decay has been investigated by pulse NMR techniques. The line shapes and relaxation times for 'He nuclei have been measured during a 3-year period. NMR samples were prepared from five UT, synthesis batches. Because UT3 is a highly paramagnetic material which ferromagnetically orders below approximately 180 K, inhomogeneous magnetic field effects contributed to the NMR parameters. Detailed analyses of the frequency, temperature, and age dependences of these NMR parameters indicate most He atoms are retained in microscopic gas bubbles with dimensions & 500 A. No evidence was obtained to suggest significant concentrations of interstitial 'He atoms in the UT, lattice. A simple model based upon the nucleation, growth, and subsequent rupture at critical dimensions of helium bubbles is presented. This model qualitatively describes the He relaxation times and the observed 'He retention in UT, powders.

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