New Aspects on Fluorination of Bi(Pb)-Sr-Ca-Cu-O -Reasons for the Improved Superconducting Properties.-Bi(Pb)-Sr-Ca-Cu-O(F) superconductors are prepared by freeze-drying of solutions of the corresponding metal cations in the presence of F-, followed by calcination at 730 • C and sintering at 750-850 . degree.C. Powders of composition Bi1.85Pb0.35Sr1.91Ca2Cu3OyFx with x ranging from 0 to 0.79 mole are produced by this method. The superconducting properties are found to depend on the sintering conditions. At a sintering temp. of 840 • C, a significant reproducible increase of the superconducting volume fraction with increasing Fcontent is observed, whereas the superconducting properties of samples sintered below 830 • C are not improved by the fluorination. It is suggested that a grain size effect is responsible for the improved superconducting properties of the fluorinated materials sintered at the higher temperature. -(KEMNITZ, E.; SCHEURELL, S.; NAUMOV, S. W.; KASIN, P. E.; PERSHIN, V. I.; KREMER, R. K.; Eur.
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