| 摘要 |
A ceramic superconducting material contains a superconducting metal oxide phase, which has a high transition temperature, on the basis of the system Me1-Me2-Cu-O, the metal components Me1 and Me2 at least containing a rare earth metal and/or an alkaline earth metal. Appropriate materials can be formed by means of a sintering treatment. This generally requires undesirably high annealing temperatures. In order to be able to reduce the annealing temperatures, the metal component Me1 in the superconducting material according to the invention is partially replaced by B or the metal component Me2 partially replaced by Pb, up to a respective proportion of 30 atom %, so that then a superconducting metal oxide phase of the system (Me1, B)-Me2-Cu-O or Me1-(Me2, Pb)-Cu-O, respectively, has formed. Advantageously, this material is prepared by an oxygen-containing powder or powder mix which contains the metal components Me1, Me2 and Cu, being admixed with an amount, corresponding to the proportion to be substituted, of an oxide of the substitution material B or Pb. Then a liquid-phase sintering treatment is carried out above the melting temperature of the oxide of the substitution material in order to form the desired superconducting metal oxide phase. Preparation of a ceramic superconducting material having a high transition temperature.
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