零电阻温度高于127KT1－2223超导体制备  

THE PREPARATION OF TI-2223 SUPERCONDUCTORS WITH ZERO RESISTANCE TEMPERATURES ABOVE 127K

作　　者：吴裕生[1] 齐志伟[1] 彭秋云[1] 陈继平[1] 黄际商 崔炳 

机构地区：[1]长沙矿冶研究院

出　　处：《矿冶工程》1994年第1期66-69,共4页Mining and Metallurgical Engineering

基　　金：国家超导中心

摘　　要：本文采用初始成分为Ｔｌ＿１．８Ｃａ＿２．６Ｂａ＿２．０Ｃｕ＿３．０Ｏ＿ｙ，研究了一步合成和二步合成的短时间高温烧结及真空封闭较低温长时间热处理的Ｔｌ－２２２３制备工艺。用上述２种工艺均合成出单相性（２２２３）好的样品，其超导转变的起始温度Ｔｃ＿（ｏｎｓｅｔ）、零电阻温度Ｔｃｏ以及转变宽度△Ｔｃ分别为：一步合成样品Ｔｃ＿（ｏｎｓｅｔ）＝１３５Ｋ，Ｔｃｏ＝１２７．５Ｋ，△Ｔｃ＝５．０Ｋ，二步合成样品Ｔｃ＿（ｏｎｓｅｔ）＝１４０Ｋ，Ｔｃ。＝１２８．７Ｋ，△Ｔｃ＝７．５Ｋ。By adjusting the nominal composition to Tl_1.8Ca_2.6Ba_2.0Cu_3.0O_y and higher tem-perture sintering for a short time followed by a lower temperature heat treatment in a vacu-um quartz ampoule for a long time ,high T_c Tl-2223 superconducting samples were synthe-sized for investigating the one-and two-step processes. good samples with high contents ofTl-2223 phase have been synthesized by both the processes. For the one-step synthesizedsamples,T_c(onset)=135K,T_c(R=0)= 127. 5K △T_c=5. 0K;for the two-step samples,140K,128. 7K and 3. 5K ,respectively, The preparation techniques for increasing the T_c of Tl-2223superconductors are also discussed.

关 键 词：超导体 临界温度 制备 工艺 

分 类 号：TM260.51[一般工业技术—材料科学与工程]