?. ?. , ?. , ?. ?. , ?. , ?. et al., ??é ??s é????t?????s à ????st?t?t ??s ?r??s?r?????s à ??r?sr??? ???r ??s ??s?r??t???s ?? ??? ?r?s???? é???tr???q?? à tr??s??ss??? s?r ????s ?????s? ????tr? ??rt ?? s???tr?s????? ?P???P? ?? ?r??t?r?s ??tr? ?t ??t?r??r??????r?s ?? ?U, P uqO 2 s??t ??ss????s

?. , U. ?@bullet?-?-??t-???@bullets-?-?-??r?, ?. , ?. ????-?-?-?-t?, ?. et al., ?r?s?té s?r ??s ?r??r?étés ?é????q??s ?t ???s?q??s ??s ??tér???? ??P ??r?

?. ?r-@bullet?s-?ér?, ?. , ?. , ?. ?-?-?-rt?s-t?, ?. et al., ?? ??rt??r?????s ? s????q???t?t?t???s ?t ?? ?r???s q???t?t?t??s ?ss???és ?? ???r?s???? é???tr???q??? ????????? ?? ??t??t??? ??????è?? s?r ?? ???r?str??t?r? ?t ???????é?é?té U ?Pu ??s ?????s? t????s U 1?y P u y O 2?x ?? t?ès? s??t?

. St-paul-lez-durance, France (e-mail: jacques.lechelle@cea.fr)

P. Bleuet, A. Somogyi, and A. , Simionovici are with ESRF ID22, p.38043

. St-etienne, France (e-mail: egirard@emse.fr) Digital Object Identifier 10.1109/TNS, 2004.

J. Léchelle, R. Boyer, and M. Trotabas, A mechanistic approach of the sintering of nuclear fuel ceramics, Materials Chemistry and Physics, vol.67, issue.1-3, pp.120-132, 2001.
DOI : 10.1016/S0254-0584(00)00429-6

T. Weitkamp, C. Raven, and A. Snigirev, An imaging and microtomography facility at the ESRF beamline ID22, Proc. SPIE Developments in X-Ray Tomography II, pp.311-317, 1999.

A. Koch, F. Peyrin, P. Heurtier, B. Chambaz, B. Ferrand et al., An x-ray camera for computed microtomography of biological samples with micrometer resolution using Lu3Al5O12 and Y3Al5O12 scintillators, SPIE, pp.170-179, 1999.

A. P. Hammersley, HST: High speed tomography, ESRF, 1999.

P. Jollivet, C. D. Auwer, and E. Simoni, Evolution of the uranium local environment during alteration of SON68 glass, Journal of Nuclear Materials, vol.301, issue.2-3, pp.142-152, 2002.
DOI : 10.1016/S0022-3115(01)00759-0

URL : https://hal.archives-ouvertes.fr/in2p3-00019814

A. L. Ankudinov and S. D. Conradson, Relativistic XANES calculations of Pu hydrates, Physical Review B, vol.57, issue.13, pp.7518-7525, 1998.
DOI : 10.1103/PhysRevB.57.7518

M. P. Anderson, G. S. Grest, R. D. Doherty, K. Li, and D. J. Slorovitz, Inhibition of grain growth by second phase particles: Three dimensional Monte Carlo computer simulations, Scripta Metallurgica, vol.23, issue.5, pp.753-758, 1989.
DOI : 10.1016/0036-9748(89)90525-5

E. Morhacova, Relation between monte carlo simulations of grain growth and real structures, Crystal Research and Technology, vol.29, issue.1, pp.9-12, 1995.
DOI : 10.1002/crat.2170300125

M. P. Anderson, D. J. Slorovitz, G. S. Grest, and P. S. Sahni, Computer simulation of grain growth???I. Kinetics, Acta Metallurgica, vol.32, issue.5, pp.783-791, 1984.
DOI : 10.1016/0001-6160(84)90151-2

L. Boltzmann and L. , Zur Integration der Diffusiongleichung bei variabeln Diffusioncoefficienten, Wiedemann's Ann, Phys, vol.53, pp.959-964, 1894.
DOI : 10.1002/andp.18942891315

C. Matano, On the Relation between the Diffusion-Coefficients and Concentrations of Solid Metals (The Nickel-Copper System), Japanese Journal of Physics, vol.8, issue.109, 1933.

F. Broeder, A general simplification and improvement of the matano-boltzmann method in the determination of the interdiffusion coefficients in binary systems, Scripta Metallurgica, vol.3, issue.5, pp.321-32510, 1969.
DOI : 10.1016/0036-9748(69)90296-8

L. D. Hall, An Analytical Method of Calculating Variable Diffusion Coefficients, The Journal of Chemical Physics, vol.21, issue.1, pp.87-89, 1953.
DOI : 10.1063/1.1698631

J. Cornet, D. Glasserleme, and H. Matzke, Détermination des coefficients de diffusion chimiquè a partir de la courbe concentrationpénétration et restitution de cette courbè a partir des premiers, en milieux infinis, Premier Ministre, Commissariat l'´ energie atomique ; Rapport CEA R-4369. Division de métallurgie et d'´ etude des combustibles nucléaires. Centre d'´ etudes Nucléaires de Fontenay-aux-Roses, Centre d'´ etudes nucléaires, Service de documentation, Saclay Dependence upon oxygen potential of the interdiffusion in single crystalline UO2-(U, Pu)O2, Lindemer, Chemical thermody- namic representations of P uO 2?x and U 1?z P u z O w, pp.217-22510, 1972.

T. Besmann and T. Lindemer, Improvement in the chemical thermodynamic representation of ???PuO2 ??? x??? and ???U1 ??? zPuzOw???, Journal of Nuclear Materials, vol.137, issue.3, pp.292-293, 1986.
DOI : 10.1016/0022-3115(86)90232-1

©. 2012 and J. , Léchelle diffusion-fundamentals, pp.1-39, 2012.

C. Guéneau, N. Dupin, B. Sundman, C. Martial, J. Dumas et al., Thermodynamic modelling of advanced oxide and carbide nuclear fuels: Description of the U???Pu???O???C systems, Journal of Nuclear Materials, vol.419, issue.1-3, pp.145-167, 2011.
DOI : 10.1016/j.jnucmat.2011.07.033

J. H. Harding, D. G. Martin, P. E. Potter, and R. , Commission of the European Communities. Directorate-General for Science, Thermophysical and thermochemical properties of fast reactor materials, Commission of the European Communities, Directorate-General Science, 1989.

S. Kailasam, J. Lacombe, and M. Glicksman, Evaluation of the methods for calculating the concentration-dependent diffusivity in binary systems, Metallurgical and Materials Transactions A, vol.98, issue.3, pp.2605-2610, 1999.
DOI : 10.1007/s11661-999-0300-9

B. Messerschmidt, B. Mcintyre, S. Houde-walter, R. R. Andre, and C. Hsieb, Temperature dependence of silver-sodium interdiffusion in micro-optic glasses, Optical Materials, vol.7, issue.4, pp.165-171, 1997.
DOI : 10.1016/S0925-3467(97)00018-9

S. Mendez, Etude de l'inerdiffusion U-Pu appliquée au combustible MOX, 1995.

A. G. Nikitin, S. V. Spichak, Y. S. Vedula, and A. G. Naumovets, Symmetries and modelling functions for diffusion processes, Journal of Physics D: Applied Physics, vol.42, issue.5, pp.22-3727
DOI : 10.1088/0022-3727/42/5/055301

]. R. Hooke and T. A. Jeeves, `` Direct Search'' Solution of Numerical and Statistical Problems, Journal of the ACM, vol.8, issue.2, 1961.
DOI : 10.1145/321062.321069

©. 2012 and J. , Léchelle diffusion-fundamentals, pp.1-39, 2012.

R. B. Marinenko and S. D. Leigh, Uncertainties in electron probe microanalysis, IOP Conference Series: Materials Science and Engineering, vol.7, pp.1-10, 2009.
DOI : 10.1088/1757-899X/7/1/012017

F. Sauer and Z. Freise, Diffusion in Binary Mixtures Showing a Volume Change, Z. Elektrochem, vol.66, pp.353-363, 1962.

C. Wagner, The evaluation of data obtained with diffusion couples of binary single-phase and multiphase systems, Acta Metallurgica, vol.17, issue.2, pp.99-10710, 1969.
DOI : 10.1016/0001-6160(69)90131-X

H. Matzke, Rutherford backscattering for measuring corrosion layers on glasses for long-term storage of radioactive waste, Fresenius, Journal of Analytical Chemistry, vol.319, issue.6, pp.801-808, 1984.

S. Noyau, Etude des phénomènes d'autodiffusion et d'interdiffusion du plutonium dans des céramiques de type U 1?y P u y O 2±x, Thèse de doctorat, 2012.

Y. Zhang, M. J. Kramer, D. Banerjee, I. Takeuchi, and J. P. Liu, thin films, Journal of Applied Physics, vol.110, issue.5, pp.53914-053914, 2011.
DOI : 10.1063/1.3634063

URL : https://hal.archives-ouvertes.fr/hal-00613273

F. Guillemot and J. Debuigne, Etude Metallurgique d'Alliages de Titane pour Applications Biomedicales, These de doctorat, 2000.

I. Thibon, D. Ansel, and T. Gloriant, Interdiffusion in ??-Ti???Zr binary alloys, Journal of Alloys and Compounds, vol.470, issue.1-2, pp.127-133, 2009.
DOI : 10.1016/j.jallcom.2008.02.082

URL : https://hal.archives-ouvertes.fr/hal-00496031

M. R. Palcut, S. Rettig, R. Steuer, and . Singer, Cation diffusion in LaMnO3 Diffusion of Germanium in Binary and Multicomponent Nickel Alloys, Journal of Phase Equilibria and Diffusion, vol.32, issue.273, pp.3-198, 2011.

L. Feng, L. Huand, H. Chang, Y. Cui, and L. Zhou, Interdiffusion behavior of Ti-Mo binary system in ? phase, The Chinese Journal of Nonferrous Metals

R. Anand, C. Sudha, S. Saroja, A. L. Terrance, and M. Vijayalakshmi, Simulation of carbon diffusion profile in dissimilar weldment of ferritic steels using diffusion coefficients evaluated by den Broeders method, METAL2008, Hradec nad Moravic, 2008.

B. C. Reed, Erratum, Trends in Pharmacological Sciences, vol.21, issue.6, pp.64264610-1119, 1989.
DOI : 10.1016/S0165-6147(00)01491-7

?. ???-?, P??????rt ????s??? ?t tr??s??rt ?? ??t?èr? ???s ??s s?????s ?????r?????s ?? ???s?q??? ??s ???t???s ?? P??s?q??? ????? ??????????????????

?. ?. , @. , ?. , ?. ??-?r?tt???-?-?-?-??s?-s, ?. @bullet???? et al., ??è??s t?é?r?q??s ?? ?? str??t?r? ??s ????ts ?? ?r???s? ??s ???è??s ?? str??t?r? ??s ????ts ?? ?r???s ?t ???r ?t???s?t?