STUDY OF BINARY OXIDES OF URANIUM AND RARE-EARTH ELEMENTS

Abstract

The formation of fluorite-type phases was investigated in R2O3-U3O8- O2 systems (where R-La, Sm, Dy, Yb) annealed for 66-85 hr at 1200C, and the solubility limits of the rare earth oxides in uranium octoxide were determined. The U(VI) content and the total uranium content were determined by coulometric analysis at a controlled potential. X-ray phase analysis was carried out by using the powder method with RKD-57 and RKU-86 cameras. The degree of oxidation of uranium changes with the ratio R/U and reaches 6 in samples where R/U=2/1. Thus, the presence of a rare earth oxide increases the stability of the hexavalent state of uranium at high temperatures. Contrary to expectations, the solubility of rare earth oxides in U3O8 was found to be very low (less than 1.5 mol % of RO1.5).

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Document Details

Document Type
Technical Report
Publication Date
Dec 15, 1967
Accession Number
AD0678435

Entities

People

  • A. V. Zhelankin
  • G. G. Koshcheev
  • L. M. Kovba

Organizations

  • National Air and Space Intelligence Center

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Chemical Analysis
  • Chemical Compounds
  • Chemistry
  • Elements
  • High Resolution
  • High Temperature
  • Inorganic Chemistry
  • Lanthanum
  • Metals
  • Oxidation
  • Oxides
  • Rare Earth Elements
  • Samarium
  • Samarium Compounds
  • X Rays
  • Ytterbium

Readers

  • Astronomy/Astrophysics
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Surface Engineering/Surface Coating Technology.