Microstructural Aspects of Infiltration Growth YBCO Bulks with Chemical Pinning

摘要： Single grain YBa2Cu3O7-x (YBCO, Y123) bulk superconductors were prepared by infiltration growth (IG) process. The solid phase precursor was prepared by solid state synthesis from Y2O3+BaCuO2 powders. The influence of the composition of the source of melt for infiltration and the CeO2 addition on the transition temperature and critical current density was studied. It is shown that the studied samples are doped by Yb from the Yb2O3 substrate. The dependences of Yb concentration on the distance from the bottom of the samples were measured by EDS microanalysis at SEM. Correlation between the fabrication technology, level of Yb doping, microstructure and superconducting properties is discussed.