Towards Measuring the Pu Self-Diffusion Coefficient in Polycrystalline U0.55Pu0.45O2±x

S. Noyau; Philippe Garcia; B. Pasquet; I. Roure; Fabienne Audubert; Alexandre Maître

doi:10.4028/www.scientific.net/DDF.323-325.203

Paper Titles

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Iodine Volume Diffusion Measurements in Uranium Dioxide
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Towards Measuring the Pu Self-Diffusion Coefficient in Polycrystalline U_0.55Pu_0.45O_2±x
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Towards Measuring the Pu Self-Diffusion Coefficient in Polycrystalline U_0.55Pu_0.45O_2±x

Abstract:

This paper describes an original method to measure the plutonium self-diffusion coefficient in the mixed oxide U_0.55Pu_0.45O_2±x. This method is based on using ²⁴²Pu as a tracer atom. A thin film of the tracer was deposited on the well-polished surface of the samples and then diffusion annealings were performed from 1500°C to 1700°C, in an Ar-H₂ 5% atmosphere. The oxygen potential was fixed at-395 kJ.mol^-1. After annealing, the ²⁴²Pu self-diffusion profiles were established by means of secondary ion mass spectrometry (SIMS). The ²⁴²Pu concentration profiles were determined by assessing the relative U, Am and Pu ionisation yields according to the experimental parameters. The choice of favourable experimental conditions and the relevance of the resulting concentration profiles are discussed at length.

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Periodical:

Defect and Diffusion Forum (Volumes 323-325)

Pages:

203-208

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.323-325.203

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Online since:

April 2012

Authors:

S. Noyau, Philippe Garcia, B. Pasquet, I. Roure, Fabienne Audubert, Alexandre Maître

Keywords:

Diffusion, Mixed Oxide, Nuclear Fuel, Plutonium, SIMS, Uranium

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