TITLE

Phase transitions in plutonium: new insights from diffraction

AUTHOR(S)
Lawson, A. C.; Martinez, B.; Roberts, J. A.; Von Dreele, R. B.; Richardson, J. W.; Mehta, A.; Arthur, J.
PUB. DATE
July 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 532 Issue 1, p32
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We are using the techniques of neutron and x-ray powder diffraction to learn more about the driving forces for structural transformations in Pu metal. This research is currently being conducted in three areas: (1) understanding the low melting point of Pu, (2) measuring the intergranular stresses that arise in solid-solid phase transitions of Pu, and (3) determining whether the idiosyncratic crystal structures of Pu are stabilized by Pu atoms in different valence states at different crystallographic sites. © 2000 American Institute of Physics.
ACCESSION #
5663337

 

Related Articles

  • Theory for α- and δ-Pu. Söderlind, Per; Landa, Alex; Sadigh, Babak // AIP Conference Proceedings;2003, Vol. 673 Issue 1, p201 

    During the last few years, there has been intense research, both theoretically and experimentally aimed to understand the fundamental properties of Pu and the anomalous, but technologically important, δ phase. Pu undergoes several phase transitions as a function of temperature at ambient...

  • New Pseudophase Structure for α-Pu. Bouchet, J.; Albers, R. C. // AIP Conference Proceedings;2003, Vol. 673 Issue 1, p133 

    Pure plutonium is an exotic metal that is poorly understood. The α-Pu phase (zero-temperature ground state) is believed to have mainly itinerant 5f electrons. However, δ phase (fcc) is believed to be in neither limit (neither completely itinerant nor localized), that we may describe as...

  • Soliton microdynamics of heat conduction in plutonium and uranium in the temperature range of martensitic phase transitions. Dubovsky, O.; Semenov, V.; Orlov, A. // Physics of the Solid State;Feb2013, Vol. 55 Issue 2, p396 

    The microdynamics of large-amplitude nonlinear lattice vibrations of plutonium and uranium has been investigated at high reactor temperatures in the ranges of martensitic phase transitions. Solutions of nonlinear dynamic equations have been obtained using the Lennard-Jones interatomic potential...

  • Effects of Local Solute Ordering and Plasticity on the Delta to Alpha Transformation in Gallium-Stabilized Plutonium Alloys. Krenn, C. R.; Sadigh, B.; Schwartz, A. J.; Wolfer, W. G. // AIP Conference Proceedings;2003, Vol. 673 Issue 1, p87 

    The delta-to-alpha transformation in Ga-stabilized plutonium alloys has many unusual features. It is a thermally activated martensitic transformation with double-c transformation kinetics. The alpha product has an approximately 20% smaller volume than delta, but its volume can change an...

  • Phase Transformations in Delta-Stabilized Plutonium. Kitching, Steven; Planterose, Patrick G.; Gill, David C. // AIP Conference Proceedings;2003, Vol. 673 Issue 1, p79 

    The high-temperature delta phase (δ) of plutonium (Pu) can be retained at room temperature by the addition of small amounts of an alloying element such as gallium (Ga). Macroscopic and microscopic variations in gallium solute concentrations will, however, affect the long-term stability of the...

  • Generation of phase nuclei by solitons of the new 'undulator' type in martensitic phase transitions of crystalline materials. Dubovsky, O.; Orlov, A. // Physics of the Solid State;Aug2013, Vol. 55 Issue 8, p1703 

    The microdynamics of large-amplitude nonlinear lattice vibrations of plutonium and uranium materials has been investigated at high reactor temperatures in the ranges of martensitic phase transitions. Topologically new large-amplitude solitons of the 'undulator' type have been revealed....

  • Influence of size factors on the character of phase transformations in light actinides. Lin, É. // Physics of the Solid State;Jan2010, Vol. 52 Issue 1, p153 

    The transformations of crystalline phases of light actinides have been analyzed as the processes of formation and growth of nanoparticles. The influence of size factors on the character of martensitic phase transitions and reverse phase transformations has been investigated using plutonium as an...

  • Elastic phase transitions in plutonium. Vekilov, Yu. Kh.; Krasilnikov, O. M. // Journal of Experimental & Theoretical Physics;Sep2009, Vol. 109 Issue 3, p446 

    The rich phase diagram of plutonium with a large number of different transitions in a narrow temperature interval has been puzzling scientists for decades. We offer a theoretical proof that most of the structural transformations in plutonium at temperatures exceeding the Debye temperature are...

  • Pressure induced structural phase transition in actinide mono-bismuthides: Ab initio calculations. Pataiya, J.; Makode, C.; Aynyas, M.; Sanyal, Sankar P. // AIP Conference Proceedings;Jun2013, Vol. 1536 Issue 1, p931 

    The structural and electronic properties of mono-bismuthides of Plutonium and Americium have been investigated using tight binding linear muffin-tin-orbital (TB-LMTO) method within the local density approximation (LDA). From present study with the help of total energy calculations it is found...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics