Local structure and vibrational properties of alpha'-Pu martensitein Ga-stabilized delta-Pu

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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 {alpha}{prime} and {delta} 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 {delta}-Pu sample. EXAFS spectral components attributed to both {alpha}{prime}-Pu and {delta}-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 {alpha}{prime}-Pu and ... continued below

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Nelson, E.J.; Blobaum, K.J.M.; Wall, M.A.; Allen, P.G.; Schwartz,A.J. & Booth, C.H. February 26, 2003.

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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 {alpha}{prime} and {delta} 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 {delta}-Pu sample. EXAFS spectral components attributed to both {alpha}{prime}-Pu and {delta}-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 {alpha}{prime}-Pu and the fcc {delta}-Pu structures. In {delta}-Pu, we measure a Ga-Pu bond length contraction of 0.11 Angstroms with respect to the Pu-Pu bond length. The corresponding bond-length contraction around Ga in {alpha}{prime}-Pu is only 0.03 Angstroms. Results from temperature-dependent Pu LIII-edge EXAFS measurements are fit to a correlated Debye model, and a large difference in the Pu-Pu bond Debye temperature is observed for the {alpha}{prime} and {delta} phases: {theta}{sub cD}({alpha}{prime})=159{+-}13 K versus {theta}{sub cD}({delta})=120{+-}3 K. The corresponding analysis for the Ga K EXAFS determines a Ga-Pu bond Debye temperature of {theta}{sub cD}({delta})=188{+-}12 K in the {delta}-Pu phase. These results are related to the observed solubility of Ga in {delta}-Pu, the ''stabilization'' of {delta}-Pu by Ga at room temperature, and the insolubility of Ga in {alpha}{prime}-Pu.

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  • Journal Name: Physical Review B; Journal Volume: 67; Journal Issue: 22; Related Information: Journal Publication Date: 11/11/2003

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  • Report No.: LBNL--52413
  • Report No.: UCRL-JC-151541
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1103/PhysRevB.67.224206 | External Link
  • Office of Scientific & Technical Information Report Number: 917805
  • Archival Resource Key: ark:/67531/metadc891300

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  • February 26, 2003

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  • Sept. 22, 2016, 2:13 a.m.

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Nelson, E.J.; Blobaum, K.J.M.; Wall, M.A.; Allen, P.G.; Schwartz,A.J. & Booth, C.H. Local structure and vibrational properties of alpha'-Pu martensitein Ga-stabilized delta-Pu, article, February 26, 2003; United States. (digital.library.unt.edu/ark:/67531/metadc891300/: accessed August 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.