High temperature superconductor YBa2Cu3O7–x (YBCO) nanopowders were successfully prepared by a citrate pyrolysis technique. The phase formation and microstructure of the nanopowders were studied. The microstructure a...High temperature superconductor YBa2Cu3O7–x (YBCO) nanopowders were successfully prepared by a citrate pyrolysis technique. The phase formation and microstructure of the nanopowders were studied. The microstructure analysis shows that the obtained YBCO powders have very fine grains with a size around several tens of nanometers. The superfine morphology reveals that the thermal agglomeration of the particles decreases with decreasing the annealing temperature and shortening the annealing time. In addition, the complete phase formation of YBCO depends upon the annealing temperature and the annealing time as well. So far, these nanopowders have been used to fabricate the melt-textured YBCO bulk materials.展开更多
基金This work was supported by Educational Commission Foundation of Fujian Province (No. JB03012) and the National Natural Science Foundation of China (No.50372052)
文摘High temperature superconductor YBa2Cu3O7–x (YBCO) nanopowders were successfully prepared by a citrate pyrolysis technique. The phase formation and microstructure of the nanopowders were studied. The microstructure analysis shows that the obtained YBCO powders have very fine grains with a size around several tens of nanometers. The superfine morphology reveals that the thermal agglomeration of the particles decreases with decreasing the annealing temperature and shortening the annealing time. In addition, the complete phase formation of YBCO depends upon the annealing temperature and the annealing time as well. So far, these nanopowders have been used to fabricate the melt-textured YBCO bulk materials.
