自从1986年J.G.Bednorz和K.A.M(?)ller发现La-Ba-Cu-O高超导转变温度的超导材料以来,1981年以Y代La得到了超导转变温度在液氮沸点以上的超导材料。这些材料都含有稀土和类稀土元素,因而一时稀土元素的身价升高。但是,法国Caen大学的C.Michel等人明智而大胆地逆潮流而动,提出了不用稀土元素而制造高超导转变温度超导材料的设想,并于1987年6月宣布制成了Bi-Sr-Cu-O新超导材料,其超导转变温度在7～22K之间。尽管从当时已获得液氮温区超导来看,这个超导转变温度值还比较低,但是新材料不含稀土元素且性能比较稳定,所以引起了注意。 Since 1986, JGBednorz and KAM? Ller found La-Ba-Cu-O high superconducting transition temperature of superconducting materials, in 1981 to Y generation La get a superconducting transition temperature above the boiling point of liquid nitrogen superconducting material. These materials contain rare earths and rare earth elements, which temporarily increased the price of rare earth elements. However, C. Michel, Caen University, France, who wisely and boldly moved against the tide, put forward the idea of ​​producing high superconducting transition temperature superconducting materials without using rare earth elements and announced in June 1987 that Bi- Sr-Cu-O new superconducting materials, the superconducting transition temperature between 7 ~ 22K. Although this superconducting transition temperature is still relatively low in view of the superconductivity of the liquid nitrogen temperature at that time, it is noticed that the new material contains no rare earth elements and has relatively stable properties.