Nb(Ba)加强Bi系中2223相生成作用研究  

A STUDY OF Nb(Ba) ENHANCEMENT 2223 PHASE FORMATION IN Bi-BASED SUPERCONDUCTORS

作　　者：李言荣[1] 李有谟[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《物理学报》1992年第8期1357-1360,共4页Acta Physica Sinica

摘　　要：固相法合成系列名义组成为Bi_(2-x)Nb_xSr_2Ca_2Cu_3Oy(x=0—1.0)的样品,电学和磁学测量表明,当掺入x=0.2—0.3的Nb有明显加强2223相生成的作用,配比为Bi_(1.7)Nb_(0.3)Sr_2Ca_2Cu_3Oy时最佳;当掺Ba以部分取代Sr后有明显协同Nb促进22 23相生成的作用,比单掺Nb效果更为显著,其中以Bi_(1.7)Nb_(0.3)Sr_(1.8)Ba_(0.2)Ca_2Cu_3Oy为最优组成。热重分析(TGA)实验显示,掺Nb(Ba)后样品在～600°C出现吸氧增重;XPS中的O_(1s)峰显示掺Nb(Ba)后除～531eV的主峰外,在～529eV的肩峰更加明显;讨论了Nb(Ba)对晶体结构的可能影响。Properties of a series of superconducting compounds of nominal composition (Bi2-x,Nbx)Sr2Ca2(Cu3-yNby)Ox (x - 0-1.0, y - 0-1.0) have been investigated using electrical resistivity, a.c magnetic susceptibility and X-ray powder diffraction measurements. When x - 0.2-0.3 or y - 0.2, 2223 phase (Tc ~ 110K) in samples is significantly enhanced. The added Nb in the sample with Bi1.7Nb0.3Sr2Ca2 Cu3Oy has obvious effect of promoting 2223 phase. When furthermore doping Ba as replacing Sr in BiNbSrCaCuO, it is observed that double-doped Nb-Ba has more evident enhancing the high-Tc phase formation than single-doping Nb. The doped Nb-Ba in sample with nominal composition Bi1.7Nb0.3Sr1.8Ba0.2Ca2Cu3Oy is distinctly favour to formation of 2223 phase. From TGA experiment, the weight of sample doping Nb(Ba) at ~ 600℃ begin to increase by absorbing oxygen. By XPS of O1 in sample doped with Nb(Ba), the shoulder peak at ~ 529eV is more evident except for ~ 531eV as main peak.

关 键 词：BI系 掺杂 2223相生成 超导 铌 钡 

分 类 号：TM261[一般工业技术—材料科学与工程]