Since the discovery of superconductivity of the BiSrCuO system at 20K, the work of synthesizing high Tc superconductors without rare-earths by adding some elements other than rare-earths in the BiSrCuO system has made...Since the discovery of superconductivity of the BiSrCuO system at 20K, the work of synthesizing high Tc superconductors without rare-earths by adding some elements other than rare-earths in the BiSrCuO system has made a lot of progress. Recently, N. Fukushima et al. have synthesized Bi4Sr4RE2Cu4O16+δ (RE = Nd, Eu or Y) by substituting RE for Ca in the Bi4Sr4Ca2Cu4O16+δ superconductor and revealed that it has a crystal structure identical with this superconductor, but it is an insulator. In this paper, the authors report the superconductivity and structure of the BiSrCaEuCuO compound synthesized by adding 5 at% of rare-earth Eu in the BiSrCaCuO system.展开更多
Have developed a Bi-Pb-Sr-Ca-Cu-O superconductor with an onset Tc of 108K and a zero resistance temperature Tco of 104K. There are at least five different phases: the high Tc and low Tc ones and three minor ones. The ...Have developed a Bi-Pb-Sr-Ca-Cu-O superconductor with an onset Tc of 108K and a zero resistance temperature Tco of 104K. There are at least five different phases: the high Tc and low Tc ones and three minor ones. The high Tc and low Tc phases have the face - centered orthorhombic structure with a = 0.540nm, b = 0.545nm, c = 3.669nm and a = 0.540nm b = 0.546nm, c = 3.077nm, respectively. The former has the superstructure of 3.24nm, and the latter has the superstructure of 2.7nm and is incommensurate in the b direction.展开更多
文摘Since the discovery of superconductivity of the BiSrCuO system at 20K, the work of synthesizing high Tc superconductors without rare-earths by adding some elements other than rare-earths in the BiSrCuO system has made a lot of progress. Recently, N. Fukushima et al. have synthesized Bi4Sr4RE2Cu4O16+δ (RE = Nd, Eu or Y) by substituting RE for Ca in the Bi4Sr4Ca2Cu4O16+δ superconductor and revealed that it has a crystal structure identical with this superconductor, but it is an insulator. In this paper, the authors report the superconductivity and structure of the BiSrCaEuCuO compound synthesized by adding 5 at% of rare-earth Eu in the BiSrCaCuO system.
文摘Have developed a Bi-Pb-Sr-Ca-Cu-O superconductor with an onset Tc of 108K and a zero resistance temperature Tco of 104K. There are at least five different phases: the high Tc and low Tc ones and three minor ones. The high Tc and low Tc phases have the face - centered orthorhombic structure with a = 0.540nm, b = 0.545nm, c = 3.669nm and a = 0.540nm b = 0.546nm, c = 3.077nm, respectively. The former has the superstructure of 3.24nm, and the latter has the superstructure of 2.7nm and is incommensurate in the b direction.
