Abstract
Extended x-ray absorption fine structure spectroscopy (EXAFS) is used to investigate the local atomic environment and vibrational properties of plutonium and gallium atoms in the a' and d phases of a mixed phase Pu-Ga alloy. EXAFS results measured at low temperature compare the structure of the mixed phase sample with a single-phase d-Pu sample. EXAFS spectral components attributed to both a'-Pu and d-Pu were observed in the mixed phase sample. Ga K-edge EXAFS spectra indicate local atomic environments similar to the Pu LIII-edge EXAFS results, which suggests that Ga is substitutional for Pu atoms in both the monoclinic a'-Pu and the fcc d-Pu structures. In d-Pu, we measure a Ga-Pu bond length contraction of 0.11 A with respect to the Pu-Pu bond length. The
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