Formation Process of 2223 Phase in Bi-Pb-Sr-Ca-Cu-O System via Calcining at 1073K

SHIMONO Isao, KIJIMA Norihito, NAGATA Shoichi, KONISHI Hajime, HAMAGUCHI Yoshikazu

doi:10.2109/jcersj.104.101

The formation process of the 2223 phase synthesis via conventional calcining condition has been systematically investigated using XRD, SEM/EDX, TG/DTA and TMA. The calcining powder prepared at 1073K for 18ks consists of 2201 phase, 2212 phase, Ca₂PbO₄, CaO, CuO and Sr_14-xCa_xCu₂₄O₄₁. With increasing a holding time in firing process at 1133K, 2212 phase, Ca₂PbO₄ and Sr_14-xCa_xCu₂₄O₄₁ did decrease, and 2223 phase, Ca_2-xSr_xCuO₃ and Bi_0.5Pb₃Sr_2.5Ca₂CuO_x increased. It was considered that 2223 phase, Ca_2-xSr_xCuO₃ and Bi_0.5Pb₃Sr_2.5Ca₂CuO_x were formed by reaction with 2212 phase, Ca₂PbO₄ and Sr_14-xCa_xCu₂₄O₄₁. The liquid phase was formed from 1113 to 1133K in firing process, and then Sr_14-xCa_xCu₂₄O₄₁ was drastically formed reaction with the liquid phase and CuO. The reason that needs long term-heat treatment to synthesize 2223 phase with conventional calcining condition is regarded as formation of Sr_14-xCa_xCu₂₄O₄₁.

Formation Process of 2223 Phase in Bi-Pb-Sr-Ca-Cu-O System via Calcining at 1073K

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