Phase Equilibrium in Multicomponent System and Material Design of Bi-based Suprconductors

多组分体系的相平衡与铋基超导体材料设计

• 批准号: 11450238
• 负责人: OSAMURA Kozo
• 金额: $ 10.5万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450238/
• 关键词: Phase Diagram; Invariant Reaction; Two Phase Equilibrium; Superconductive Phase; Phase Rule; Single Phase Region; Bi-based Superconductor; Mechanical Property

In order to investigate the phase diagram of Bi-Pb-Sr-Ca-Cu-O, we designed an unique cell preventing the loss of volatile elements, Bi and Pb, which is consisted of container and lid made from silver. It was confirmed that oxygen diffuses out through the silver layer, but other cations do not lose in the temperature range between 750 and 850 ℃. Mainly the phase relations relating to Bi2212 an Bi2223 have been investigated. Firstly the invariant reaction was made clear under constant pressure. By using the experimental data with respect to the phase relations, the phase diagram of multi-component system has been established by means of the computer soft "Thermo-Calc".The samples exhibiting high critical current density consist of multi-phases with 4 to 6 phases.When the precise control of composition and temperature was carried out, the volume fraction of Bi2223 phase was achieved to 90-95% while the critical current density was maximized and the mechanical property was greatly improved.

为了研究Bi-Pb-Sr-Ca-Cu-O体系的相图，我们设计了一种独特的防止挥发性元素Bi和Pb损失的电池，该电池由银制成的容器和盖子组成。结果表明，在750 ~ 850 ℃的温度范围内，氧通过银层扩散出去，但其它阳离子没有损失。主要研究了Bi 2212和Bi 2223的相关系。首先明确了恒压下的不变量反应。利用实验数据，利用计算机软件Thermo-Calc建立了多组分体系相图，具有高临界电流密度的样品由4 ~ 6相的多相组成，当成分和温度精确控制时，Bi_（2223）相的体积分数达到90-95%，临界电流密度达到最大，力学性能得到较大提高。

项目成果

K.Osamura 他: "Mechanical Properties of Ag/Bi2223 Composite Superconductors"Adv.Cryogen.Eng. 46. 639-645 (2000)

K.Osamura 等人：“Ag/Bi2223 复合超导体的机械性能”Adv.Cryogen.Eng. 46. 639-645 (2000)

K.Osamura 他: "Mechanical Properties of Ag/Bi2223 Composite Superconductors"Adv. Cryogen. Eng.. 46. 639-645 (2000)

K.Osamura 等人：“Ag/Bi2223 复合超导体的机械性能”Adv. Eng. 46. 639-645 (2000)

K.Osamura et al: "Mechanical Properties of Ag/Bi2223 Composite Superconductors"Adv. Cryog. Eng.. Vol.46. 639-645 (2000)

K.Osamura 等人：“Ag/Bi2223 复合超导体的机械性能”Adv.

T.Horita, K.Osamura, 他: "Microstructure Dependence of Transport Characteristics of Ag/Bi2223 Tapes under Applying DC and AC Currents"Adv.Cryogen.Eng.. 46. 777-784 (2000)

T.Horita、K.Osamura 等人：“施加 DC 和 AC 电流下 Ag/Bi2223 胶带传输特性的微观结构依赖性”Adv.Cryogen.Eng.. 46. 777-784 (2000)

K.Osamura 他: "Weak Link Path Model and E-J characterics in Ag/Bi2223 Tapes"Inst. Phys. Conf. Ser.. 167. 575-578 (2000)

K.Osamura 等：“Ag/Bi2223 磁带中的弱连接路径模型和 E-J 特性”Inst. Phys. 167. 575-578 (2000)