TY - JOUR
T1 - Effect of Additive Compositional Alkaline Earth Metal Oxides and Fluorides on Critical Current Density of Superconductors in the Bi (Pb)-Sr-Ca-Cu-O System
AU - Yamamoto, Ryoichi
AU - Yada, Setsuo
AU - Naka, Shigeharu
AU - Itoh, Hideaki
AU - Mazaki, Hiromasa
AU - Takada, Jun
PY - 1991
Y1 - 1991
N2 - The effects of the additives of 0.005–0.3mol of CaC03(CaO), SrO, CaF2 and SrF2 to 2mol of the “2223” phase on the sintering behavior and the superconducting properties were investigated. The “2223” phase had a composition of Bi1. 8Pb0. 4Sr2. oCa2. oCu3. 2Oy. The typical sintering temperature was 850°C for the CaO- or SrO- added system and was a little lower −840°C, for the CaF2- or SrF2-added system, when the sintering was conducted for 120hr using specimens press-formed at 5000 kg/cm2. The bulk density of the 0.3mol CaO-added specimen sintered at 850°C was 4.8g/cm3, and the critical current density, Jc at 77K, was −103A/cm2, better than that of the SrO-added specimen. The fluoride-added specimens had higher densities 5.3-5.5g/cm3, while the Jc was not increased. Tc was not influenced by the additives and remained at −110K.
AB - The effects of the additives of 0.005–0.3mol of CaC03(CaO), SrO, CaF2 and SrF2 to 2mol of the “2223” phase on the sintering behavior and the superconducting properties were investigated. The “2223” phase had a composition of Bi1. 8Pb0. 4Sr2. oCa2. oCu3. 2Oy. The typical sintering temperature was 850°C for the CaO- or SrO- added system and was a little lower −840°C, for the CaF2- or SrF2-added system, when the sintering was conducted for 120hr using specimens press-formed at 5000 kg/cm2. The bulk density of the 0.3mol CaO-added specimen sintered at 850°C was 4.8g/cm3, and the critical current density, Jc at 77K, was −103A/cm2, better than that of the SrO-added specimen. The fluoride-added specimens had higher densities 5.3-5.5g/cm3, while the Jc was not increased. Tc was not influenced by the additives and remained at −110K.
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U2 - 10.2497/jjspm.38.1053
DO - 10.2497/jjspm.38.1053
M3 - Article
AN - SCOPUS:0026258172
VL - 38
SP - 1053
EP - 1057
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 8
ER -