Cation Contents and Superconducting Properties of the High-Tc Phase of Bi-Pb-Sr-Ca-Cu-O Ceramics
Abstract
Energy dispersive X-ray analysis was carried out on samples with the starting compositions of Bi1-xPbxSr0.8CaCu1.4Oy (x{=}0.15, 0.20, 0.25). The Bi and Pb contents in the high-Tc phase were about 80% of the starting contents. A narrow range of solid solutions exists in the Bi-Pb-Sr-Ca-Cu-O system. It seems that Pb does not enter the Cu or Ca site. The temperature dependence of the initial magnetization curve was measured. The slope of the curve at 100 K was lower than that at 77 K. Therefore, it seems that superconducting phases with Tc’s lower than 100 K exist, although these phases show the same X-ray diffraction pattern as the high-Tc phase.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- December 1988
- DOI:
- 10.1143/JJAP.27.L2280
- Bibcode:
- 1988JaJAP..27L2280M
- Keywords:
-
- Bismuth Oxides;
- Cations;
- High Temperature Superconductors;
- Magnetization;
- Mixed Oxides;
- Calcium Oxides;
- Copper Oxides;
- Hot Pressing;
- Lead Oxides;
- Strontium Compounds;
- X Ray Analysis;
- Solid-State Physics