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.
Oxide Oxygen Polymer High Pressure Transition Temperature
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