抄録
Superconductive oxide fine powders were prepared by spray pyrolysis using an ultrasonic atomizer. The as-prepared particles had spherical shape in submicron order with narrow size distribution. Fluorescence X-ray analysis and EDS analysis showed that the powder composition was in good agreement with the starting solution composition. Experimental factors (concentration, pyrolysis temperature and flow rate) influenced the powder characteristics such as particle size and crystal structure. The particle size distribution and particle morphology were independent of the experimental factors. Tc of YBa2Cu3O7-x ceramics was 92K, while those of Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox ceramics were 86K and 110K, respectively. The addition of PbO modified the superconducting properties, and Tc of the ceramics was higher than that without PbO. Tc of PbO doped Bi2Sr2Ca2Cu3Ox ceramics was appreciably dependent on the sintering conditions.
