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Ultrasonic Spray Pyrolysis 법에 의한 Bi₂Sr₂Ca₂Cu₃O<SUB>x</SUB> 분말합성 및 특성평가
배병수(Bung-Su Bae),정상진(Sang-Jin Jung),이봉(Bong Lee),문창권(Chang-Kwun Moon),최희락(Hee-Lack Choi) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.6
Superconductor material Bi₂Sr₂Ca₂Cu₃Ox(Bi-2223) powders were synthesized by ultrasonic spray pyrolysis method. It is dear that Bi-2223 phase more than Bi-2212 phase was acquired at sufficient synthesized time. Best condition for Bi-2223 phase was synthesizing temperature at 860℃. We also investigated the effects for concentrations and viscosities of starting liquid precursor as well as temperature distribution if reacting furnace. The size if synthesized powder was decreased by decreasing the concentration of starting liquid precursor. Modified reacting furnace with four different temperature heating zones gave us successful results for desirable nano-powder induding Bi₂Sr₂Ca₂Cu₃Ox phase. Citric acid addition to starting liquid precursor showed increasing of the size for synthesized powder. Bi-2223 single phase was acquired from Bi2223 and Bi-2212 mixed phases through heat treatment in box furnace at 24 hours.