Abstract
It has been shown, that different starting materials result in Tl−Ca−Ba−Cu−O superconductors of different type even at the same heat treatment process. This manifests itself in the developing structure, in the number, share-rate and superconducting properties of the occurring phases as well. Microcrystals, phase-compositions, crystallinities, unit cells, onset and critical temperatures, magnetic flux exclusions, critical currents, magnetizations and critical magnetic fields essentially unlike from each other have been observed, depending on the starting materials. The presence of a starting compound having low melting point, as Ba(NO3)2 can cause a more compact, better superconducting final product, implying better connection between the grains.
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Kirschner, I., Leppävuori, S., Laiho, R. et al. Magnetic properties of TlCaBaCuO4.5 compounds prepared from different starting materials. Z. Physik B - Condensed Matter 78, 381–387 (1990). https://doi.org/10.1007/BF01313318
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DOI: https://doi.org/10.1007/BF01313318