Low-temperature instability in [sup 242]Pu[sub 0.98]Ga[sub 0.02].

PDF Version Also Available for Download.

Description

We have made an unsuccessful attempt to make a detailed characterization by neutron powder diffraction of the {delta}-{alpha}' transformation that is known to occur at low temperatures in dilute Pu-Ga alloys. The {alpha}'-structure is a variant of the monoclinic a {alpha}'-phase, except that the lattice constants are a bit different, with some (or all) of the Pu sites partially occupied by Ga. This transformation is easily detected by dilatometric methods because of the 19% volume difference between the {delta} and {alpha}'-phases. In our study, we used 242Pu in a Pu0.98Ga0.02 alloy to minimize neutron absorption and cooled the sample very ... continued below

Physical Description

5 p.

Creation Information

Lawson, A. C. (Andrew C.); Martinez, B. S. (Barbara S.); Roberts, J. A. (Joyce A.) & von Dreele, R. B. (Robert B.) January 1, 2001.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

We have made an unsuccessful attempt to make a detailed characterization by neutron powder diffraction of the {delta}-{alpha}' transformation that is known to occur at low temperatures in dilute Pu-Ga alloys. The {alpha}'-structure is a variant of the monoclinic a {alpha}'-phase, except that the lattice constants are a bit different, with some (or all) of the Pu sites partially occupied by Ga. This transformation is easily detected by dilatometric methods because of the 19% volume difference between the {delta} and {alpha}'-phases. In our study, we used 242Pu in a Pu0.98Ga0.02 alloy to minimize neutron absorption and cooled the sample very slowly to maximize the degree of transformation. We did not detect any transformation to the {alpha}'-phase, but instead observed a slight line broadening effect that was visible in the raw data. The onset temperature of the line broadening (150K) coincides with observations of the {delta}-{alpha}' transformation. We have developed two alternative explanations for the line broadening effect: (1) the occurrence at low temperatures of a cubic-tetragonal transformation in Ga-stabilized alloy or (2) the occurrence at low-temperature of a spontaneous anisotropic microstrain that is supported by the highly anisotropic elastic constants of {delta}-Pu.

Physical Description

5 p.

Source

  • Submitted to: International Conference Actinides 2001/Journal of Nuclear Science and Technology, Nov. 4-9, 2001, Hayama, Japan

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: LA-UR-01-5833
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975829
  • Archival Resource Key: ark:/67531/metadc933298

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

Description Last Updated

  • Dec. 12, 2016, 12:22 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 2

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

International Image Interoperability Framework

IIF Logo

We support the IIIF Presentation API

Lawson, A. C. (Andrew C.); Martinez, B. S. (Barbara S.); Roberts, J. A. (Joyce A.) & von Dreele, R. B. (Robert B.). Low-temperature instability in [sup 242]Pu[sub 0.98]Ga[sub 0.02]., article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc933298/: accessed August 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.