Open AccessPolycrystalline gamma-plutonium’s elastic moduli versus temperature
Author(s) -
Izabela Stroe,
Jonathan Betts,
A. Trugman,
C. H. Mielke,
J. N. Mitchell,
Michael Ramos,
Franz J. Freibert,
Hassel Ledbetter,
A. Migliori
Publication year - 2010
Publication title -
the journal of the acoustical society of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.619
H-Index - 187
eISSN - 1520-8524
pISSN - 0001-4966
DOI - 10.1121/1.3271036
Subject(s) - resonant ultrasound spectroscopy , materials science , debye model , crystallite , elastic modulus , shear modulus , poisson's ratio , bulk modulus , modulus , young's modulus , composite material , poisson distribution , condensed matter physics , thermodynamics , physics , mathematics , metallurgy , statistics
Resonant ultrasound spectroscopy was used to measure the elastic properties of pure polycrystalline (239)Pu in the gamma-phase. Shear and longitudinal elastic moduli were measured simultaneously and the bulk modulus was computed from them. A smooth, linear, and large decrease in all elastic moduli with increasing temperature was observed. The Poisson ratio was calculated and an increase from 0.242 at 519 K to 0.252 at 571 K was found. These measurements on extremely well-characterized pure Pu are in agreement with other reported results where overlap occurs. We calculated an approximate Debye temperature Theta(D)=144 K. Determined from the temperature variation in the bulk modulus, gamma-Pu shows the same Gruneisen parameter as copper.
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