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Journal of Materials Science

, Volume 29, Issue 13, pp 3419–3424 | Cite as

The influence of processing pressure on the formation of the high-Tc 2223 phase in Bi-Pb-Sr-Ca-Cu-O superconductors

  • G. Grabert
  • G. H. Haertling
Article

Abstract

The effects of processing pressure on the superconducting critical transition temperature, Tc, of Bi1.6Pb0.4Sr1.9Ca2.05Cu3.05 Ox were investigated. Uniaxial cold- and hot-pressed samples prepared from mixed oxide and chemically coprecipitated powders were studied. The uniaxial cold-pressed specimens were pressed at a low pressure of 34.5 M Pa (5000 p.s.i.) and a high pressure of 138.7 M Pa (20 120 p.s.i.) and sintered at 845 °C for times ranging from 24–200 h. The mixed oxide samples showed a 0.5 K increase in Tcas the pressure was increased, while the chemically coprecipitated samples showed a 3.6 K increase in Tcwith the same increase in pressure. The uniaxial hot-pressed specimens were hot pressed at 845 °C for 6 h in oxygen at a pressure of 34.5 MPa (5000 p.s.i.) and post-annealed for 24–30 h in air at 845 °C. These samples, both mixed oxide and chemically coprecipitated, showed an increase in Tcof approximately 25 K from the hot-pressed state to the post-annealed state. The highest Tcachieved by either of these processing methods was 108.4 K.

Keywords

Oxide Oxygen Polymer High Pressure Transition Temperature 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • G. Grabert
    • 1
  • G. H. Haertling
    • 1
  1. 1.The Gilbert C. Robinson Department of Ceramic EngineeringClemson UniversityClemsonUSA

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