Local Structure and Vibrational Properties of α'-Pu Martensitein Ga-Stabilized δ-Pu Metadata

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Title

  • Main Title Local Structure and Vibrational Properties of α'-Pu Martensitein Ga-Stabilized δ-Pu

Creator

  • Author: Nelson, E. J.
    Creator Type: Personal
  • Author: Blobaum, K. J. M.
    Creator Type: Personal
  • Author: Wall, M. A.
    Creator Type: Personal
  • Author: Allen, P. G.
    Creator Type: Personal
  • Author: Schwartz, A. J.
    Creator Type: Personal
  • Author: Booth, C. H.
    Creator Type: Personal

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: United States
    Additional Info: COLLABORATION - LLNL

Date

  • Creation: 2003-02-26

Language

  • English

Description

  • Content Description: 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.

Subject

  • Keyword: Fine Structure
  • Keyword: Gallium
  • Keyword: Spectra
  • Keyword: Bond Lengths
  • Keyword: Martensite
  • Keyword: Absorption
  • Keyword: Stabilization
  • Keyword: Atoms
  • Keyword: Debye Temperature
  • STI Subject Categories: 75
  • Keyword: Spectroscopy
  • Keyword: Contraction
  • Keyword: Solubility
  • Keyword: Plutonium

Source

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

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

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