Accession Number:

AD0680052

Title:

HIGH TEMPERATURE THERMAL EXPANSION OF UO2 AND ThO2

Descriptive Note:

Technical rept. Jul 1967-Jul 1968

Corporate Author:

CINCINNATI UNIV OH

Personal Author(s):

Report Date:

1968-10-01

Pagination or Media Count:

26.0

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.

Subject Categories:

  • Physical Chemistry
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE