Enhancement of critical current density in the Bi-Pb-Sr-Ca-Cu-O system by addition of Ca<sub>2</sub>CuO<sub>3</sub>
S X Dou; S J Guo; H K Liu; K E Easterling; S X Dou; Sch. of Mater. Sci. & Eng., New South Wales Univ., Kensington, NSW, Australia; S J Guo; Sch. of Mater. Sci. & Eng., New South Wales Univ., Kensington, NSW, Australia; H K Liu; Sch. of Mater. Sci. & Eng., New South Wales Univ., Kensington, NSW, Australia; K E Easterling; Sch. of Mater. Sci. & Eng., New South Wales Univ., Kensington, NSW, Australia
Журнал:
Superconductor Science and Technology
Дата:
1989-12-01
Аннотация:
The influence of Ca<sub>2</sub>CuO<sub>3</sub> doping on the superconducting properties of the Bi-Pb-Sr-Ca-Cu-O system has been studied. It was found that, while the Ca<sub>2</sub>CuO<sub>3</sub> addition increased the amount of non-superconducting phases as well as decreased the T<sub>c</sub> and density, the critical current density was significantly improved. The J<sub>c</sub> of the 0.2 M Ca<sub>2</sub>CuO<sub>3</sub>-doped Bi<sub>1.6</sub>Pb<sub>0.4</sub>Sr<sub>1.6</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>y</sub> sample was 405 A cm<sup>-2</sup> at 77.3 K, whereas it was 197 A cm<sup>-2</sup> for the undoped sample. The fact that both samples were treated under the same conditions suggests that the Ca<sub>2</sub>CuO<sub>3</sub> dopant may play an important role as a flux pinning centre in this material.
318.4Кб