摘要
本文从材料物理化学角度详细研究了Bi-Sr-Ca-Cu-O系统固相反应历程和各组元的反应行为。探明此固相反应经历3个不同阶段,分别于680—790℃形成中间相,呈电绝缘性;790—860℃生成2212超导相,呈超导电性;860—970℃在液相参与下形成半导体相,呈半导体特征。确认T_c为85K的2212超导相是经由一个Bi-Sr-Ca-O四元中间相Bi Sry Ca_(1-y) O_(2.5)(0≤y≤0.75)与CuO以及SrO、CaO反应而成,提出并验证了用预先合成中间相制备高单相性的2212超导相的分步合成工艺方法。
The solid phase reaction process of Bi-Sr-Ca-Cu-O system and the reaction behavior of each component in view of material physical chemistry are studied in detail in the paper. It revealed that the reaction is carried out in three different stages: forming insulating interphase at 680—790~C; forming 2212 superconducting phase at 790—860℃; forming semiconducting phases in the presence of liquid phase at 860—970℃. It is also confirmed that 2212 superconducting phase (T_c=85K) is formed by the reaction ofa Bi-Sr-Ca-O quarternary interphase together with CuO, SrO and CaO. A new two-step method has been presented and used to prepare 2212 superconducting phase with fine monophase by presynthesized interphase.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1992年第2期169-174,共6页
Journal of The Chinese Ceramic Society
基金
浙江大学科学基金
关键词
超导体
陶瓷
反应历程
机理
high critical temperature superconductor
bismuth system ceramics
reaction process
reaction mechanism
