Effect of B2O3, La2O3, and SnO2 additions on the formation and microstructure of Bi-2223 phase in the partial-melting and sintering process

被引：0

作者：

Lu, XY ^{[1
]}

Nagata, A ^{[1
]}

Echigoya, N ^{[1
]}

Sugawara, K ^{[1
]}

Kamada, S ^{[1
]}

机构：

[1] Akita Univ, Fac Engn & Resource Sci, Akita 0108502, Japan

来源：

ADVANCES IN CRYOGENIC ENGINEERING, VOLS 50A AND B | 2004年 / 711卷

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D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Effects of B2O3, La2O3, and SnO2 additions on the formation and microsructure of the Bi-2223 phase in the partial-melting and sintering process has been studied by means of XRD, SEM, EDS, DTA, VSM, and AC susceptibility measurements. The bulk samples with compositions Bi1.8Pb0.4Sr1.9Ca2.1Cu3.5BaOy (a=0, 0.02, 0.04, 0.06, 0.08, 0.1), Bi1.8Pb0.4Sr1.9Ca2.1Cu3.5LabOy (b=0, 0.005, 0.01, 0.02, 0.04, 0.06) and Bi-1.8(Pb1.cSnc)(0.4)Sr1.9Ca2.1Cu3.5Oy (c=0, 0.1, 0.2, 0.3, 0.4, 0.5) were prepared by sintering at 825-850degreesC for various times after partial-melting at 875degreesC for I hour. The sample with a=0.02 B2O3 addition shows the highest conversion of Bi-2212 phase to the Bi-2223 phase. B2O3 addition decreases the melting temperature of the Bi-2212 phase. B2O3 overdoping (a>0.04) decreases the conversion of the Bi-2212 phase to the Bi-2223 phase due to increasing the amount of non-superconducting secondary phases. La2O3 and SnO2 additions decrease the conversion of the Bi-2212 phase to the Bi-2223 phase. No new phases precipitated by B2O3, La2O3, and SnO2 additions have been observed in the range of our experiments.

引用

页码：593 / 600

页数：8

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