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- W2051330250 abstract "In non-stoichiometric oxides (NiO, CoO, Cu2O…) two thermodynamic parameters (temperature T and partial pression of oxygen Po2) are necessary in order to fix the population of point defects. When one of these two parameters (T or Po2) is suddenly changed and a physical property is continuously recorded, a “transient” can be observed due to the diffusion of the point defects in order to reach the new thermodynamic equilibrium population. Many works have been devoted to the majority point defects (non-stoichiometry). In this paper we present an overview about the high temperature transitory plastic deformation which is related with the minority point defects. Dans les conditions normales, deux paramétres sont nécessaries pour fixer l'état thermodynamique des oxydes binaires, lorsque leur composition peut varier. On emploie habituellement la temperature T et la pression partielle Po2 d'oxygéne de l'atmosphére environnante. Cela permet de faire varier la stoechiometrie de Cu2O, NiO, CoO… et n'a pas d'effet sur Al2O3, ZrO2, etc. A la suite d'un changement brusque de T ou Po2, la diffusion des défauts ponctuels induit des transitoires sur les proprietés physiques des oxydes. Dans des travaux anterieurs on a examiné les comportements liés à la non-stoechiometrie, c'est à dire reliés aux défauts majoritaires. Ici, nous examinons le cas de la deformation plastique á haute température qui est reliée aux défauts minoritaires. Des transitoires ont été observés dans les oxydes non-stoechiometriques (NiO, CoO, Cu2O), mais pas dans ceux qui ne présentent pas d'écart à la stoechiometrie (Al2O3, ZrO2)." @default.
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- W2051330250 date "1995-10-01" @default.
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- W2051330250 title "Point defect concentration relaxation and creep transients in binary oxides" @default.
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- W2051330250 doi "https://doi.org/10.1016/0956-7151(95)90144-2" @default.
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