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GROWTH OF Bi-2223 PHASE FROM TEXTURED Bi-2212 PHASE SOLIDIFIED IN HIGH MAGNETIC FIELDS

高磁场中固化的有织构 Bi-2212 相中 Bi-2223 相的生长

基本信息

批准号：
13650799
负责人：
NAGATA Akihiko
金额：
$ 2.18万
依托单位：
AKITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

1) Effect of Ag_2O,MgO and B_2O_3 additions on microstructure and superconducting properties of Bi-2223 phase after solidification in high magnetic fields:5%MgO and 5%Ag_2O additions improved the texture of Bi-2223 phase slightly after solidification in high magnetic fields but B2O3 addition never improved. MgO addition also improved the Jc value estimated from ΔM of hysteresis loop measured by VSM.2) Texture and superconducting properties of Bi-2201 phase solidified in high magnetic fields:Non-stoichiometric Bi-2201 phase were solidified in a magnetic field of 1OT. A Large, well c-axis aligned Bi-22O1 phase was obtained. As for the anisotropy, Jc flowed perpendicular to the applied magnetic field is about 10 times larger than that flowed parallel to it. On the contrary, no texture was observed in the Bi-22O1 sample solidified without a magnetic field.3) Formation and texture of Bi-2223 phase during sintering in high magnetic fields:Samples were sintered in the temperature range from 835 to 86O℃ in a magnetic field of 10T. Texturing of Bi-2223 phase was improved with increasing sintering temperature up to 855℃, however the volume fraction of Bi-2223 phase decreased with increasing sintering temperature. No Bi-2223 phase was observed after sintering at 860℃ where the liquid phase existed, but only well-aligned Bi-2212 phase was obtained.

1)添加Ag_2O、MgO和B_2O_3对强磁场下凝固后的Bi-2223相组织和超导性能的影响：添加5%的MgO和5%的Ag_2O使强磁场下凝固后的Bi-2223相的织构略有改善，但添加B_2O_3并未改善其织构。2)强磁场下凝固的Bi2201相的织构和超导性能：非化学计量比的Bi2201相在1OT的磁场下凝固。得到了尺寸较大、c轴取向良好的Bi2O1相。在各向异性方面，垂直于外加磁场的Jc比平行于其的Jc大约10倍。3)强磁场下烧结过程中Bi2223相的形成和织构：在10T的磁场下，样品在835~860℃的温度范围内烧结。当烧结温度达到85 5℃时，随着烧结温度的升高，Bi2 2 2 3相的织构得到改善，但其体积分数随烧结温度的升高而降低。当烧结温度为860℃时，未观察到有液相存在的Bi2223相，但得到了取向良好的Bi2212相。