J. Phys. I France 2 (1992) 63-67
Some diffusive properties of oxygen in Y-Ba-Cu-O systemsD. Djurek1, V. Manojlovic1, Z. Medunic1, M. Prester2, E. Babic3 and K. Zadro3
1 Volta Applied Ceramics, 41000 Zagreb, Croatia, Yugoslavia
2 Institute of Physics of the University of Zagreb, 41000 Zagreb, Croatia, Yugoslavia
3 Department of Physics, Faculty of Natural Sciences, 41000 Zagreb, Croatia, Yugoslavia
(Received 21 August 1991, accepted 4 October 1991)
We have studied the diffusive properties of oxygen in Y-Ba-Cu-O systems at 940 C by measurements of the resistive response time of the samples subjected to the step-like increase of the oxygen pressure to 5 bars. The superconducting (SC) transition widths plotted versus inverse diffusion constant obey the universal linear dependence. The characteristic protruded tail of the real part of AC susceptibility which exhibits the feature at 86 K is absent in samples with the nominal composition Y 3Ba 3Cu 6O x (Y-336) in the regime s as result of weakly connected grains of YBa 2Cu 3O (Y-123) nucleated from decomposed Y-336 phase.
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