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- W1970681041 abstract "Diffusion coefficients of silver into alumina were determined by the radiotracer method. For bulk, dislocations and grain boundaries, the Arrhenius equations were, respectively: D (m2s−1) = 2· 10−4exp(−331 (kJ mol−1)RT); Dd· αd·a2(m4s−1) = 4.3·10−16exp(−321(kJ mol−1)/RT); P = D′· α′ · δ(m3s−1) = 9.2·10−6exp(−321(kJ mol−1)/RT). In bulk, silver diffused faster than other elements; diffusion was probably accomplished through interstitial octahedral sites, and the large misfit induced by the silver atoms could be related to the low activation energy of silver compared with that of the self-interstitial. Along dislocations and grain boundaries, a rather large increase of diffusivity was observed. The high values of D'· α'/ D ratios for silver could be explained assuming a segregation coefficient α′ = 2000, in agreement with the semi-empirical models for grain-boundary segregation in alumina. The measured activation energies Q, Qd and Q' were very close. Such behaviour was difficult to explain with regard to the high values of Dd/D or D′/D, about 104. This suggested the intervention of a mixed diffusion path, where jumps from structural unoccupied octahedral sites to aluminium vacancies would be highly probable, together with an increase of vacancy concentration along the grain boundaries." @default.
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- W1970681041 date "1989-01-01" @default.
- W1970681041 modified "2023-09-27" @default.
- W1970681041 title "Fast diffusion of Silver in single and Polycrystals of α-Alumina" @default.
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- W1970681041 doi "https://doi.org/10.1016/0022-3697(89)90447-2" @default.
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