Tl_2Ba_2Ca_2Cu_3O_(10)近单相超导体的制备  

PREPARATION OF SUPERCONDUCTORS OF NEAR SINGLE PHASE Tl_2Ba_2Ca_2Cu_3O_(10)

作　　者：孟宪仁 沈德元[1] 林明柱[1] 涂清云[1] 林振金 桑利华 刘振兴 

机构地区：[1]北京师范大学物理系,北京100875 [2]中科院北京物理所,北京100080

出　　处：《低温物理学报》1993年第3期196-201,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金

摘　　要：本文报道用特制的可耐30个大气压保护的密封炉制备近单相Tl_2Ba_2Ca_2Cn_3O_(10)超导体,它的零电阻温度和抗磁起始温度均为124K。结果表明样品的2223相含量直接与采用的标称配比有关。样品的超导性主要依赖合成期间对T1损失的控制。退火过程中理想的氧压也改善超导电性。该系统兼有封管式和快速反应二种方法的优点。In this paper, we report the preparation of superconductors of near single phase Tl2Ba2Ca2Cu3O10, which was synthesized by a special and sealed furnace fearing protective gas of 30 atmosphere, Its zero resistance temperature and diamagnetic onset temperature are all at 124K. Results indicates that the 2223 phase content of specimon relate directly to nominal composition. Superconductivity of sample depends mainly on the contral of Tl loss during synthesis. A ideal oxygen pressure of the anneling process improve also the superconductivity. The system has advantage of sealed tube mothed and quick reaction method.

关 键 词：超导体 制备 单相性 铊 

分 类 号：O511.1[理学—低温物理]