The Elastic Moduli of Monoclinic and Orthorhombic Plutonium
ORAL
Abstract
Measurements were made of the bulk and shear moduli of high-purity polycrystalline Pu from 10K to 670K using resonant ultrasound spectroscopy. A simple dilatometer was employed to provide redundant detection of the phase transitions. We observed the expected phase transitions from monoclinic ($\alpha )$ to body centered monoclinic ($\beta )$ to orthorhombic ($\gamma )$ to face centered cubic ($\delta )$. Very accurate values were obtained for $\alpha $-Pu, $\beta $-Pu was very soft and difficult to analyze, as was $\delta $-Pu. Surprisingly, the $\gamma $-phase produced the high-Q resonances needed for accurate elastic modulus determination. We discuss also the unusual temperature dependences.
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Authors
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Albert Migliori
National High Magnetic Field Laboratory, Pulsed Field Facility, LANL, Los Alamos, NM 87545, National High Magnetic Filed Laboratory-LANL, Los Alamos, NM, Los Alamos National Laboratory, 1, NHMFL / LANL
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Jon Betts
National High Magnetic Field Laboratory, Pulsed Field Facility, LANL, Los Alamos, NM 87545, Los Alamos National Laboratory, NHMFL / LANL
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Cristian Pantea
Los Alamos National Laboratory, 1
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I. Mihut
National High Magnetic Filed Laboratory-LANL, Los Alamos, NM, Los Alamos National Laboratory
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C. Mielke
Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory
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J.N. Mitchell
Los Alamos National Laboratory