Chemical diffusion of oxygen in thoria-urania solid solution

Tatsumi Arima, K. Kitano, K. Takemura, H. Furuya

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The chemical diffusion coefficients of oxygen were measured for the (Th1-y, Uy)O2+x with uranium content y of 1, 3 and 5mol% in the temperature range of 1213-1313K under the oxidizing or reducing atmosphere. The magnitude of activation energies obtained for oxygen diffusion was in good agreement with the migration energy which is calculated based on interstitialcy mechanism by Colbourn. With increasing uranium content, the chemical diffusion coefficient increased and the activation energy for oxygen diffusion decreased slightly in the present experimental conditions. The excess oxygen were soluble into the (Th1-y, Uy)O2+x sample, so that the interaction energy between the higher valence uranium ions and interstitial oxygen ions might increase with decreasing uranium content. The effect of oxygen partial pressure on both the chemical diffusion coefficient and the lattice parameter of (Th1-y, Uy)O2+x could not be found. The lattice constant decreased linearly with uranium content, which indicated that the relation between these parameters obeyed Vegard's law.

Original languageEnglish
Pages (from-to)37-45
Number of pages9
JournalThermochimica Acta
Volume344
Issue number1-2
Publication statusPublished - Jan 28 2000

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Thoria
Uranium
uranium
Solid solutions
solid solutions
Oxygen
oxygen
diffusion coefficient
Lattice constants
activation energy
Activation energy
Ions
oxygen ions
partial pressure
lattice parameters
interstitials
Partial pressure
valence
atmospheres
energy

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Cite this

Arima, T., Kitano, K., Takemura, K., & Furuya, H. (2000). Chemical diffusion of oxygen in thoria-urania solid solution. Thermochimica Acta, 344(1-2), 37-45.

Chemical diffusion of oxygen in thoria-urania solid solution. / Arima, Tatsumi; Kitano, K.; Takemura, K.; Furuya, H.

In: Thermochimica Acta, Vol. 344, No. 1-2, 28.01.2000, p. 37-45.

Research output: Contribution to journalArticle

Arima, T, Kitano, K, Takemura, K & Furuya, H 2000, 'Chemical diffusion of oxygen in thoria-urania solid solution', Thermochimica Acta, vol. 344, no. 1-2, pp. 37-45.
Arima T, Kitano K, Takemura K, Furuya H. Chemical diffusion of oxygen in thoria-urania solid solution. Thermochimica Acta. 2000 Jan 28;344(1-2):37-45.
Arima, Tatsumi ; Kitano, K. ; Takemura, K. ; Furuya, H. / Chemical diffusion of oxygen in thoria-urania solid solution. In: Thermochimica Acta. 2000 ; Vol. 344, No. 1-2. pp. 37-45.
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