| 摘要 |
Bi, Pb, Sr, Ca, Cu nitrates were weighed by cation ratio of 2-x:y:2.2:3(x, y= 0.2- 0.4), and dissolved in distilled water adding nitric acid. Pb, Sr, Ca, Cu nitrates were dissolved in distilled water. The two solutions was mixed and spray-dried at 10,000- 13,000 rpm, 200- 270 deg.C of inlet temperature, 120- 140 deg.C of outlet temperature, 10- 70 ml/minute of input velocity. The powder was calcined at 800- 820 deg.C for 3 hours, followed by heat-treatment at 830- 850 deg.C for 30- 100 hours to give title superconductor.
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