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
研究了五种无限供应的 Bilayer 膜金属/硅体系中(Ni/Si,Cu/Si,Nb/Si,Mo/Si,Ti/Si),因离子束注入引起的界面原子交混及相变过程。界面温度和注入离子剂量显著影响薄膜相变,在生成各种金属 Si 化物及固溶体时,反应温度和生长激活能大大降...研究了五种无限供应的 Bilayer 膜金属/硅体系中(Ni/Si,Cu/Si,Nb/Si,Mo/Si,Ti/Si),因离子束注入引起的界面原子交混及相变过程。界面温度和注入离子剂量显著影响薄膜相变,在生成各种金属 Si 化物及固溶体时,反应温度和生长激活能大大降低,相变动力学过程与热退火反应不尽相同,诱导离子和基体取向对成相生长也有影响。讨论了相应微观机理。展开更多
I. INTRODUCTION The new rare-earth-free Bi-Sr-Ca-Cu-O superconducting material is possessed of higher critical temperature, stable properties and cheaper price with fine prospects. Since the new system was first repor...I. INTRODUCTION The new rare-earth-free Bi-Sr-Ca-Cu-O superconducting material is possessed of higher critical temperature, stable properties and cheaper price with fine prospects. Since the new system was first reported by H, Maeda et al. in Jan. 1988, much research works on the sys- tem has been undertaken~|2-5|. After the sharp drop of resistivity at 110 K a bulk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.
文摘研究了五种无限供应的 Bilayer 膜金属/硅体系中(Ni/Si,Cu/Si,Nb/Si,Mo/Si,Ti/Si),因离子束注入引起的界面原子交混及相变过程。界面温度和注入离子剂量显著影响薄膜相变,在生成各种金属 Si 化物及固溶体时,反应温度和生长激活能大大降低,相变动力学过程与热退火反应不尽相同,诱导离子和基体取向对成相生长也有影响。讨论了相应微观机理。
文摘I. INTRODUCTION The new rare-earth-free Bi-Sr-Ca-Cu-O superconducting material is possessed of higher critical temperature, stable properties and cheaper price with fine prospects. Since the new system was first reported by H, Maeda et al. in Jan. 1988, much research works on the sys- tem has been undertaken~|2-5|. After the sharp drop of resistivity at 110 K a bulk
