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| - Kinetics of oxygen desorption in Y Ba2Cu3O7-δ
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| - Abstract. In this paper the kinetics of oxygen desorption from Y Ba2Cu3O7-δ has been investigated and measurements carried out in the temperature range 350-750 C. It is shown that the oxygen desorption is diffusion-controlled (and not surface-controlled), and characteristic of diffusion from small grains in a loosely coupled porous matrix. At every temperature a number of time constants with well-defined ratios appear and have been identified and measured. These time constants can be related to the average bulk diffusion constant which shows an Arrhenius behaviour with deviations around 750°C which are ascribed to the well-known orthorhombic to tetragonal transition. In this paper we establish the basic underlying physical mechanism of oxygen desorption in Y Ba2Cu3O7-δ.
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