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Local Structure and Vibrational Properties of α-Pu, α-U, and the α-U Charge Density Wave

Published online by Cambridge University Press:  26 February 2011

Erik J. Nelson ,
Patrick Allen ,
Kerri J. Blobaum ,
Mark A. Wall  and
Corwin H. Booth
Erik J. Nelson
Affiliation:
nelson87@llnl.gov, United States
Patrick Allen
Affiliation:
allen42@llnl.gov, Lawrence Livermore National Laboratory, L-125, P.O. Box 808, Livermore, CA, 94582, United States
Kerri J. Blobaum
Affiliation:
blobaum1@llnl.gov, United States
Mark A. Wall
Affiliation:
Wall1@llnl.gov, United States
Corwin H. Booth
Affiliation:
CHBooth@lbl.gov, United States
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Abstract

The local atomic environment and vibrational properties of monoclinic α-Pu, orthorhombic α-U, and the α-U charge-density-wave (CDW) modulation are examined by extended x-ray absorption fine structure spectroscopy (EXAFS). Debye-Waller factors from temperature-dependent EXAFS measurements are fit to a correlated Debye model. The observed Pu-Pu bond Debye temperature is θcD(α-Pu) = 162 ± 5 K for the pure α-Pu phase. The temperature dependence of the U-U nearest neighbor and second nearest neighbor Debye-Waller factors exhibits a sharp discontinuity in slope near TCDW = 43 K, the transition temperature at which the charge-density wave (CDW) in α-U occurs. Our measurement of the CDW using EXAFS is the first observation of the structure of the CDW in polycrystalline α-U.

Keywords

bondingstructuralactinide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ03-09
Copyright
Copyright © Materials Research Society 2006

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