High Tc Phase of Bi-Sr-Ca-Cu-O Superconductor
Abstract
High Tc superconducting phase above 100 K in a Bi-Sr-Ca-Cu-O superconductor was found to appear in proportion to the time of the sintering just below the melting temperature. The changes of the magnetic susceptibility for this high Tc phase corresponded well to the behavior of 4.8° peak in X-ray diffraction pattern taken with Cu-Kα, which indicated that the high Tc phase contains triple Cu-O layers sandwiched by two Bi2O2 layers. The mechanism of the high Tc phase formation is proposed such that a disproportionation into triple and single Cu-O layers occurs from 80 K phase with double Cu-O layers to form the high Tc and a semiconducting phase, respectively.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- May 1988
- DOI:
- 10.1143/JJAP.27.L846
- Bibcode:
- 1988JaJAP..27L.846N
- Keywords:
-
- Bismuth Oxides;
- Electrical Resistivity;
- High Temperature Superconductors;
- Magnetic Permeability;
- Mixed Oxides;
- Sintering;
- Calcium Oxides;
- Copper Oxides;
- Strontium Compounds;
- Temperature Dependence;
- X Ray Diffraction;
- Solid-State Physics