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迄今报道具有最高零电阻温度T_(co)=125K的超导体是T1系氧化物,但Tl_2O_3极易挥发且剧毒,使其研究与应用均受限制。除Tl系外,最高T_(co)(118K)的超导体由中南工业大学于1989年制备,其名义组成为(Bi_(1.7)Pb_(0.3))Sr_2Ca_2Cu_3(O_(y-0.70)F_(0.7)),具有超导转变温度T_0(onset)=125K。由于Bi系不含稀土元素,备受注目。鉴于模式识别方法在化学中应用颇有成效,近来我们应用它研究1989年实验数据,预报可能具有高T_c的实验条件与名义组成,并据此成功地制备了T_c(onset)=135K且T_(co)=118K的含F、Bi系超导体。
So far reported with the highest zero temperature resistance T co (co) = 125K superconductors are T1 oxide, but Tl_2O_3 extremely volatile and highly toxic, its research and application are limited. In addition to the Tl system, the highest T co (118K) superconductor was prepared by Central South University of Technology in 1989 with the nominal composition of (Bi 1.7 Pb 0.3) Sr 2 Ca 2 Cu 3 (O y 0.70 F 0.7) ), With a superconducting transition temperature of T_0 (onset) = 125K. As the Department of Bi rare earth elements, much attention. Recently, we applied it to study the experimental data of 1989 and predicted the experimental conditions and nominal composition that may have high T_c. Based on this, we successfully prepared T_c (onset) = 135K and T_ ( co) = 118K containing F, Bi-based superconductors.