高温超伝導体SrCaBiCu₃O_xセラミックスの性質

抄録

Superconducting properties of SrCaBiCu₃O_x ceramics have been studied. The ceramics sintered at 820°C showed a two-step superconducting transition at 117K and 64K. The ceramics sintered at 900°C had the highest transition temperature, i.e. T_{c, zero}=80K. The Sr-Ca-Bi-Cu-O system is considered to contain a phase with superconducting transition temperature (above 100K) higher than that in Ba-Y-Cu-O systems. The melting point of this material is 875°C. The weight loss due to oxygen removal which occurred in Ba-Y-Cu-O system was not observed up to 850°C. X-ray diffraction analysis and microstructure observation were examined.