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- W3157431326 abstract "Reactions at the interface between YBa 2 Cu 3 O 6.8 (Y123) and metals (Cu, Ni or Al) were studied using quasi-infinite diffusion couples metal/Y123 which were encapsulated and annealed at 350 to 800°C for 5 to 150 h. The phase formation at the interface was analyzed in cross-sections of these couples using optical and scanning electron microscopy together with energy- and wavelength dispersive X-ray microanalysis. In addition, bulk powder mixtures of Y123 with Cu, Ni or Al were annealed up to 600 h at 800°C (500°C for Al) and phase analysis was performed using X-ray diffraction. At the Cu/Y123 interface a Cu 2 O layer grows in an initial stage and eventually a multiphase reaction zone develops. These complex reaction products are consistent with thermodynamic considerations and the bulk powder results. At the Ni/Y123 interface a thin NiO layer grows slowly, and at the seemingly inert Al/Y123 interface an extremely thin Al 2 O 3 layer is assumed. Both oxide layers act as an efficient diffusion barrier, blocking the further reaction which occurred vigorously in the bulk powder mixtures Ni+Y123 and, even stronger, in Al+Y123. A reaction mechanism via a transient formation of Al 2 O, is proposed. The kinetics of the layer growth is diffusion controlled with a parabolic law for Cu and Ni. A quantitative comparison with the oxide growth in air reveals that the growth is much faster for the contact reaction metal/Y123 compared with metal/gas. The activation energies for the Cu/Y123 and the Cu/gas reactions are similar, whereas the activation energy for the Ni/Y123 reaction is about half the value of the Ni/gas reaction" @default.
- W3157431326 created "2021-05-10" @default.
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- W3157431326 date "1995-04-01" @default.
- W3157431326 modified "2023-10-11" @default.
- W3157431326 title "Interface Reactions between Metals (Cu, Ni, Al) and YBa2Cu3O6.9" @default.
- W3157431326 doi "https://doi.org/10.1515/ijmr-1995-860409" @default.
- W3157431326 hasPublicationYear "1995" @default.
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