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Point defects and oxygen diffusion in fluorite type oxides

P. CRISTEA1,* , M. STAN2, J. C. RAMIREZ2

Affiliation

  1. University of Bucharest – Faculty of Physics, Bucharest-Măgurele, Romania
  2. Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Abstract

We present thermodynamic models of point defects formation in fluorite-type oxides with important technological applications, such as hypostoichiometric ceria CeO2-x and plutonia PuO2-x. The concentrations of defect species were calculated at different temperatures and partial pressures of oxygen. To highlight some of the current capabilities of the approach, a number of example applications, including the calculation of defect configuration entropy, and the calculation of self and chemical diffusivities of oxygen as a function of nonstoichiometry and temperature are addressed. The results provided by the modeling are validated against available experimental data on non-stoichiometry and oxygen diffusivity..

Keywords

Point defects, Diffusion, Nuclear fuels.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

P. CRISTEA, M. STAN, J. C. RAMIREZ, Point defects and oxygen diffusion in fluorite type oxides, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1750-1756 (2007)