Bi-Sr-Ca-Cu-O superconducting fibers have been successfully prepared by means of the laser-heated pedestal growth method.The superconductivity of the fiber sample is closely related to the composition of source materi...Bi-Sr-Ca-Cu-O superconducting fibers have been successfully prepared by means of the laser-heated pedestal growth method.The superconductivity of the fiber sample is closely related to the composition of source material,the power of focused laser beams,the pull rate of growing fiber,and the condition of post-annealing.The typical size of samples is 150μm×30mm.The onset of transition was 118K,and zero resistance was 85K.The majority phase in the fibers is the 85K(2-2-1-2)phase of the Bi-Sr-Ca-Cu-O materials.Samples are stable and reproduceable.展开更多
The bulk superconductors of the Bi-Sr-Ca-Cu-O system with resistance close to zero at the temperature above 110K have been prepared by solidstate reaction techniques.The onset of,transition is 125K.and the resistance ...The bulk superconductors of the Bi-Sr-Ca-Cu-O system with resistance close to zero at the temperature above 110K have been prepared by solidstate reaction techniques.The onset of,transition is 125K.and the resistance of the bulk samples has a sharp drop(~98%)near the Tc and is close to zero at 111K.Samples show a good stability.It has been implied that completely cutting off the"resistive tail"of this bulk superconductors should be possible.展开更多
文摘Bi-Sr-Ca-Cu-O superconducting fibers have been successfully prepared by means of the laser-heated pedestal growth method.The superconductivity of the fiber sample is closely related to the composition of source material,the power of focused laser beams,the pull rate of growing fiber,and the condition of post-annealing.The typical size of samples is 150μm×30mm.The onset of transition was 118K,and zero resistance was 85K.The majority phase in the fibers is the 85K(2-2-1-2)phase of the Bi-Sr-Ca-Cu-O materials.Samples are stable and reproduceable.
文摘The bulk superconductors of the Bi-Sr-Ca-Cu-O system with resistance close to zero at the temperature above 110K have been prepared by solidstate reaction techniques.The onset of,transition is 125K.and the resistance of the bulk samples has a sharp drop(~98%)near the Tc and is close to zero at 111K.Samples show a good stability.It has been implied that completely cutting off the"resistive tail"of this bulk superconductors should be possible.
