TY - JOUR
T1 - Microstructure and critical current densities of Bi-2223 superconductor solidified in high magnetic fields
AU - Lu, Xiaoye
AU - Nagata, Akihiko
AU - Watanabe, Kazuo
AU - Nojima, Tsutomu
AU - Sugawara, Kazuhisa
AU - Kamada, Shin Ichi
AU - Hanada, Shuji
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2002/4
Y1 - 2002/4
N2 - The microstructure and critical current densities of Bi-2223 superconductor with Ag2O and MgO additions after partial-melting and solidification in high magnetic fields were investigated. It has been found that the Bi-2212 grains with their c-axis parallel to the magnetic field are formed after partial-melting and solidification in 8 T magnetic field, and transform into the Bi-2223 grains with c-axis alignment during the further sintering process at 1113 K in zero magnetic field. The optimum partial-melting temperatures Tmax of non-added, 5 mass%Ag2O and 5 mass%MgO added samples are 1147 K, 1143 K and 1153 K, respectively. 5 mass%Ag2O and 5 mass%MgO additions enhance the c-axis alignment of (Bi, Pb)-2223 phase. The largest Jc value appears in the 5 mass%MgO added sample with Tmax=1153 K. MgO particles homogeneously disperse in the oriented (Bi, Pb)-2223 platelets. The MgO added sample has small non-superconducting second phase particles, whereas the Ag2O added sample has large second phase particles.
AB - The microstructure and critical current densities of Bi-2223 superconductor with Ag2O and MgO additions after partial-melting and solidification in high magnetic fields were investigated. It has been found that the Bi-2212 grains with their c-axis parallel to the magnetic field are formed after partial-melting and solidification in 8 T magnetic field, and transform into the Bi-2223 grains with c-axis alignment during the further sintering process at 1113 K in zero magnetic field. The optimum partial-melting temperatures Tmax of non-added, 5 mass%Ag2O and 5 mass%MgO added samples are 1147 K, 1143 K and 1153 K, respectively. 5 mass%Ag2O and 5 mass%MgO additions enhance the c-axis alignment of (Bi, Pb)-2223 phase. The largest Jc value appears in the 5 mass%MgO added sample with Tmax=1153 K. MgO particles homogeneously disperse in the oriented (Bi, Pb)-2223 platelets. The MgO added sample has small non-superconducting second phase particles, whereas the Ag2O added sample has large second phase particles.
KW - Bismuth oxide superconductor
KW - Critical current density
KW - Magnetic field
KW - Microstructure
KW - Solidification
KW - Texture
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U2 - 10.2320/jinstmet1952.66.4_254
DO - 10.2320/jinstmet1952.66.4_254
M3 - Article
AN - SCOPUS:0036543309
VL - 66
SP - 254
EP - 259
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 4
ER -