Bi_<2-x>Pb_xSr_2Ca_2Cu_3O_<10>酸化物超伝導体の合成に及ぼす仮焼温度の影響

概要

論文の詳細を見る
An extensive and systematic study of heat treatment for the synthesis of the 2223 phase has been performed. Results of X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive X-ray micro-analysis(EDX) are presented. It is found experimentally that the most efficient heat treatment temperature to obtain the specimen having a high volume fraction of 2223 phase is 1133 K. The formation of the 2223 phase begins substantially in only one hour after the reaching to 1133 K. In addition, the thermal hysteresis is essential. Once the specimen is calcined below 1133 K, for example at 1073 K, impurities such as Ca(Sr)-Cu oxides are inevitably included in the final product, even though the firing is made subsequently at 1133 K. The forming of the Ca(Sr)-Cu oxides, which arise from the intermediate step in the heat treatment process, influences strongly and prohibits to grow the 2223 phase. It is stressed that the calcining at 1133 K is important and key technique.
社団法人日本セラミックス協会の論文
1998-12-01