1073Kでか焼した場合のBi系2223相の生成過程

概要

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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 1073 K for 18 ks consists of 2201 phase, 2212 phase, Ca_2PbO_4, CaO, CuO and Sr_<14-x>Ca_xCu_<24>O_<41>. With increasing a holding time in firing process at 1133 K, 2212 phase, Ca_2PbO_4 and Sr_<14-x>Ca_xCu_<24>O_<41> did decrease, and 2223 phase, Ca_<2-x>Sr_xCuO_3 and Bi_<0.5>Pb_3Sr_<2.5>Ca_2CuO_x increased. It was considered that 2223 phase, Ca_<2-x>Sr_xCuO_3 and Bi_<0.5>Pb_3Sr_<2.5>Ca_2CuO_x were formed by reaction with 2212 phase, Ca_2PbO_4 and Sr_<14-x>Ca_xCu_<24>O_<41>. The liquid phase was formed from 1113 to 1133 K in firing process, and then Sr_<14-x>Ca_xCu_<24>O_<41> 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-x>Ca_xCu_<24>O_<41>.
社団法人日本セラミックス協会の論文
1996-02-01