使用XRD,SEM-EDX和LAS-3000联合谱仪研究了YBCO-Ag界面与表面。结果表明,YBCO体内掺0.4 mol Ag对123结构无影响.Ag偏聚在晶界上使晶粒间变得明显清晰;AES分析指出Ag偏聚在表面上,降低了YBCO-金属导线的接触电阻.实验还证实,不论掺入的原料是单质(Ag粉)还是化合物(Ag_2O,AgNO_3),经高温退火处理,Ag总是以单质形态固溶和偏聚在晶界及表面上,由于Ag的室温电阻率很小,有利于增强超导颗粒间的连通性。
Interfaces and surfaces of YBa_2Cu_3O_(7-x) (YBCO)-Ag have been studied by SEM-EDX and AES. No effect of Ag on 123 structure in X-ray diffraction pattern was observed for 0.4 mol Ag doped YBCO. AES analysis indicated that Ag segregated on surface of YBCO and resulted in decrease of YBCO-metal lead resistance. In addition, solution and segregation of Ag as elemental state were often appreared on interfaces and surfaces of high temperature annealed YBCO, whether elemental Ag or compound Ag_2O and AgNO_3 adopted as doping material.
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