STABILIZATION OF UO$sub 2$ BY VALENCE COMPENSATION

PDF Version Also Available for Download.

Description

UO/sub 2/, when heated in air, will transform to U/sub 3/O/sub 8/. The U/sub 3/O/sub 8/ which is formed exhibits appreciable vapor pressure at temperatures in excess of l200 deg C. The need for a stable high-temperature nuclear fuel requires prevention of the U/sub 3/O/sub 8/ transformation as well as a lowering of the vapor pressure. A method by which this may be accomplished involves compensation of the valence change of U, as it undergoes oxidation. This is accomplished by massive addition of other metal oxides. Solid-state studies of the U-La-O system were conducted in the investigation to elicit more ... continued below

Physical Description

Pages: 28

Creation Information

Wilson, W.B. February 1, 1959.

Context

This report 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 report can be viewed below.

Who

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

Author

Publisher

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 report. Follow the links below to find similar items on the Digital Library.

Description

UO/sub 2/, when heated in air, will transform to U/sub 3/O/sub 8/. The U/sub 3/O/sub 8/ which is formed exhibits appreciable vapor pressure at temperatures in excess of l200 deg C. The need for a stable high-temperature nuclear fuel requires prevention of the U/sub 3/O/sub 8/ transformation as well as a lowering of the vapor pressure. A method by which this may be accomplished involves compensation of the valence change of U, as it undergoes oxidation. This is accomplished by massive addition of other metal oxides. Solid-state studies of the U-La-O system were conducted in the investigation to elicit more detailed understanding of the processes involved The oxidation and vaporization characteristics of UO/sub 2/ were compared directly to solid solutions of U0/sub 2/ containing from 30 to 60 wt. % of La/sub 2/O/sub 3/. These solid solutions. which have the fluorite structure, were formed by reacting U0/sub 2/ and La/sub2/ O/sub3/ in vacuo. When these materials were oxidized the fluorite structure was retained with, however, reduced lattice parameters. These were shown to be equivalent to reacting U/sub 3/O/sub 8/ with La/sub 2/O/sub 3/. The volatility of the resultin g solid solutions was found to vary with the amount of additive. The composition exhibiting the lowest vapor pressure was further related to a stoichiometry between the cation and anion content. The usual approach in alloying to improve oxidation resistance is to retard the rate of oxidation. The present approach differs in that the alloying material is added to stabilize the structure and results in rapid oxidation. However. since no phase change is involved marked improvement in stabilization is obtained. An attempt a generalize the concepts developed for apolication to ether aide systems is made. (auth)

Physical Description

Pages: 28

Notes

NTIS

Source

  • Other Information: Orig. Receipt Date: 31-DEC-59

Language

Item Type

Identifier

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

  • Report No.: BMI-1318
  • Grant Number: W-7405-ENG-92
  • DOI: 10.2172/4234349 | External Link
  • Office of Scientific & Technical Information Report Number: 4234349
  • Archival Resource Key: ark:/67531/metadc1027255

Collections

This report 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 report?

When

Dates and time periods associated with this report.

Creation Date

  • February 1, 1959

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

Usage Statistics

When was this report last used?

Congratulations! It looks like you are the first person to view this item online.

Interact With This Report

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

Wilson, W.B. STABILIZATION OF UO$sub 2$ BY VALENCE COMPENSATION, report, February 1, 1959; United States. (digital.library.unt.edu/ark:/67531/metadc1027255/: accessed June 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.