T1系单相超导材料的高氧压合成及压力对超导性的影响  

SYNTHESIS OF Tl-SYSTEM MONOPHASE SUPERCONDUC-TORS UNDER OXYGEN PRESSURE AND IT'S HIGH PRESSURE EFFECT

作　　者：刘振兴[1] 孟宪仁 沈德元[1] 林明柱[1] 涂清云[1] 林振金 桑丽华[1] 彭志强[1] 

机构地区：[1]中国科学院物理研究所,北京师范大学物理系

出　　处：《高压物理学报》1995年第1期29-33,共5页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金

摘　　要：系统地研究了在０～３ＭＰａ氧压下Ｔ１系超导材料的制备过程及其超导性质。结果表明：０．２５～０．９０ＭＰａ氧压下所制备的样品为纯２２２３相，Ｔ＿（ｃ０）最高可达１２５．３Ｋ；１．４５～３．００ＭＰａ氧压下样品为纯２２１２相，Ｔ＿（ｃ０）在９５～１００Ｋ之间；０．９０～１．４５ＭＰａ氧压下样品为２２２３及２２１２两相共存。对两种单相样品的高压研究结果表明，２２２３相样品比２２１２相样品有着较强的压力效应，在０～０．５２ＧＰａ压力下分别为４．０Ｋ／ＧＰａ及２．０Ｋ／ＧＰａ。Effect of oxygen pressure on the preparation of TI-system superconductors at pres-sure 0～3MPa is reported. Under the sanie sintering temperature and in the same duration,thephase fractions and T_c as well as the weight loss are found to depend directly on the oxygen pres-sure. When the oxygen pressure is higher than 1.45MPa'we can get pure 221 2 phase supercon-ductors.The samples contain both 2212 and 2223 phase if the oxygen pressure is 0.9～1.45MPa.Pure 2223 phase samples can be obtained when the oxygen pressure is 0.25～0.gMPa.The high pressure effect on samplcs with 2223 phase and 221 2 phase also was studied. The for sample with 2223 phase is 4K/GPa,and ZK/GPa for sample with 2212 phase underpressure 0～0. 52GPa. The sample with 2223 phase has stronger pressure effect than the rsamplewith 221 2 phase.

关 键 词：氧压 压力效应 TBCO 超导合金 超导性 

分 类 号：TG132.26[一般工业技术—材料科学与工程] TM263[金属学及工艺—合金]