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1986年,Bednorz和M(?)ller在La,Ba和Cu层状钙钛矿型氧化物中发现了高于30K的超导现象,此后,高温超导材料的研究工作进展很快,接着在高于77K的液氮温区,发现了钇钡铜氧系的超导现象,被称为第二代高温超导材料。 由于稀土元素的短缺,材料科学家又试图寻找不含稀土的氧化物系高温超导材料。在不到一年的时间里,发现了铋锶钙铜氧系高温超导材料,被称为第三代高温超导材料。因此种材料不含稀土元素,给高温超导材料的研究工作,带来了新的高潮。 南京固体器件研究所在1987年研究钇钡铜氧系成功的基础上,进行了以普通电子陶瓷工艺,制备铋锶钙铜氧系材料的研究工作。按Bi:Sr:Ca:Cu=1:1:1:2的比例,选用化学纯以上的试剂进行配料。原料用两次相似的工艺进行合成:第一次合成条件为800℃下保温12小
Since 1986, Bednorz and Möller have discovered superconductivity above 30 K in La, Ba and Cu layered perovskite oxides. Since then, the work on high-temperature superconducting materials has progressed rapidly, Higher than 77K liquid nitrogen temperature zone, found yttrium barium copper oxygen superconducting phenomenon, known as the second generation of high temperature superconducting materials. Due to the shortage of rare earth elements, material scientists have also tried to find rare earth oxide-based high-temperature superconducting materials. In less than a year, found bismuth strontium calcium copper oxide high temperature superconducting materials, known as the third generation of high temperature superconducting materials. Therefore, the material does not contain rare earth elements, high temperature superconducting materials to the research work has brought a new upsurge. Nanjing Institute of Solid Devices in 1987 on the success of yttrium barium copper oxide system, carried out by ordinary electronic ceramic process, the preparation of bismuth strontium calcium copper oxide materials research work. According to the ratio of Bi: Sr: Ca: Cu = 1: 1: 1: 2, the chemical reagents are used to prepare the ingredients. The raw material is synthesized by two similar processes: the first synthesis condition is 800C for 12 hours