Metallurgical reactions and enhanced magnetic field shielding in YBCO-PbS superconductors

The metallurgical reactions occurring during sintering of PbS-doped YBCO superconductors have been investigated using thermal analysis, XRD patterns and SEM micrographs. It is shown that Pb preferentially reacts with Ba to form BaPbO 3. Addition of PbS is also found to lower the temperature of parti...

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Bibliographic Details
Published in:Materials letters 1994, Vol.18 (5), p.341-348
Main Authors: Tyagi, Anand K., Sharma, T.P.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cuprates superconductors (high tc and insulating parent compounds)
Exact sciences and technology
High-Tc compounds
Magnetic properties
Physics
Properties of type I and type II superconductors
Superconductivity
Y-based cuprates
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Summary:The metallurgical reactions occurring during sintering of PbS-doped YBCO superconductors have been investigated using thermal analysis, XRD patterns and SEM micrographs. It is shown that Pb preferentially reacts with Ba to form BaPbO 3. Addition of PbS is also found to lower the temperature of partial melting of Y 1–2–3 phase to 970°C, ensuring less porous microstructure. Moreover, the highly conductive second-phase BaPbO 3 fills the remaining vacant spaces among superconducting grains, providing better electrical contacts among grains and still dense microstructure. These materials are found to have highly promising magnetic shielding properties and increased current densities. The unique features of these materials described above are responsible for these improved characteristics.
ISSN:0167-577X
1873-4979
DOI:10.1016/0167-577X(94)90020-5