Polycrystalline gamma-plutonium's elastic moduli versus temperature

I. Stroe; J. B. Betts; A. Trugman; C. H. Mielke; J. N. Mitchell; M. Ramos; F. J. Freibert; H. Ledbetter; A. Migliori

doi:10.1121/1.3271036

Polycrystalline gamma-plutonium's elastic moduli versus temperature

I. Stroe
, J. B. Betts
, A. Trugman
, C. H. Mielke
, J. N. Mitchell
, M. Ramos
, F. J. Freibert
, H. Ledbetter
, A. Migliori

Los Alamos National Laboratory

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Resonant ultrasound spectroscopy was used to measure the elastic properties of pure polycrystalline ²³⁹P u in the γ-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 Δ_D =144 K. Determined from the temperature variation in the bulk modulus, γ-Pu shows the same Grüneisen parameter as copper.

Original language	English
Pages (from-to)	741-745
Number of pages	5
Journal	Journal of the Acoustical Society of America
Volume	127
Issue number	2
DOIs	https://doi.org/10.1121/1.3271036
State	Published - Feb 16 2010

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title = "Polycrystalline gamma-plutonium's elastic moduli versus temperature",

abstract = "Resonant ultrasound spectroscopy was used to measure the elastic properties of pure polycrystalline 239P u in the γ-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 ΔD =144 K. Determined from the temperature variation in the bulk modulus, γ-Pu shows the same Gr{\"u}neisen parameter as copper.",

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T1 - Polycrystalline gamma-plutonium's elastic moduli versus temperature

AU - Stroe, I.

AU - Betts, J. B.

AU - Trugman, A.

AU - Mielke, C. H.

AU - Mitchell, J. N.

AU - Ramos, M.

AU - Freibert, F. J.

AU - Ledbetter, H.

AU - Migliori, A.

PY - 2010/2/16

Y1 - 2010/2/16

N2 - Resonant ultrasound spectroscopy was used to measure the elastic properties of pure polycrystalline 239P u in the γ-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 ΔD =144 K. Determined from the temperature variation in the bulk modulus, γ-Pu shows the same Grüneisen parameter as copper.

AB - Resonant ultrasound spectroscopy was used to measure the elastic properties of pure polycrystalline 239P u in the γ-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 ΔD =144 K. Determined from the temperature variation in the bulk modulus, γ-Pu shows the same Grüneisen parameter as copper.

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DO - 10.1121/1.3271036

M3 - Article

SN - 0001-4966

VL - 127

SP - 741

EP - 745

JO - Journal of the Acoustical Society of America

JF - Journal of the Acoustical Society of America

IS - 2

ER -

Polycrystalline gamma-plutonium's elastic moduli versus temperature

Abstract

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