HIGH TEMPERATURE THERMAL EXPANSION OF UO2 AND ThO2

Abstract

The thermal expansion of uranium dioxide and thorium dioxide has been measured between 20 and 2100C using high temperature X-ray diffraction techniques. The thermal expansion of UO2 and ThO2 as measured by x-ray diffraction is identical to that obtained by bulk expansion measurements. Because of this, and because the specific heat of UO2 shows a rapid increase above 1700C indicating a disorder, it must be concluded that the major structural defect is a Frenkel type disorder. This probably involves the oxygen atom moving from the tetrahedral into an empty octahedral position.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1968
Accession Number
AD0680052

Entities

People

  • A. C. Momin
  • M. Hoch

Organizations

  • University of Cincinnati

Tags

DTIC Thesaurus Topics

  • Air Force
  • Crystal Lattices
  • Equations
  • Government Procurement
  • Governments
  • High Temperature
  • Materials
  • Materials Laboratories
  • Measurement
  • New York
  • Physical Properties
  • Point Defects
  • Thermal Expansion
  • United States
  • United States Government
  • X Rays
  • X-Ray Diffraction

Readers

  • Materials Science and Engineering.
  • Mathematics or Statistics
  • Nuclear Non-Proliferation and International Security