Abstract
Some changes in superconducting transition temperature Tc and normal resistivity r of YBa2Cu30x ceramics are investigated as a result of the aging stimulated by high temperature treatment and slow cooling to room temperature followed by the storage under environmental conditions during 255 hours. It is shown that the changes of these parameters fall on three specific intervals of storage time ta. In addition, different types of aging processes: fast and slow ones are observed for the heat-treated samples. It is found that the fast processes are accompanied by a slight increase of r and Tc within the first interval of storage time ta (ta ≤ 162 hrs.), while the slow processes correlate with a sharp decrease of Tc and simultaneous increase of r within the second aging interval (162 hrs. ≤ ta ≤ 206 hrs.). It is revealed that the fast and slow aging processes result from the redistribution of atoms in intergranular weak and strong links, correspondingly. The probable reason of the observed results is the formation and coexistence of various structural phases including the semiconducing one.
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