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Ar preparation of Pb rich 2212 superconductors in the BPSCCO system

✍ Scribed by M. Schlichenmaier; S. Kemmler-Sack

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
473 KB
Volume
198
Category
Article
ISSN
0921-4534

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✦ Synopsis

In the BPSCCO system of type 2212 a clear correlation between the Pb content, the structural modulation and the dimensions of the subcell exists. Pb-rich 2212 material is modulation-free and has been prepared with high purity via solid state reaction in flowing Ar. A transition to superconductivity at about 90 K is directly obtained. The superconductivity is bulk (Meissner fraction: 20-30%). The existence of modulation-free 22 12 superconductors demonstrates that neither interstitial oxygen nor structural modulation is necessary for the occurrence of superconductivity.

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A study of the formation processes of the 2212 phase in the Bi-based superconductor systems
✍ Wai Lo; B.A. Glowacki πŸ“‚ Article πŸ“… 1992 πŸ› Elsevier Science 🌐 English βš– 880 KB

A study towards the identification of the reactions contributing to and accompanying the formation of the 2212 phase from oxides and carbonates by solid state reaction processes was conducted. The formation processes were investigated by thermal analysis, powder X-ray diffractomet~ and AC magnetic s