Orientation control of grain boundaries in high-temperature superconductors and elucidation of the superconductive curret flowing mechanism, The development of high-temperature superconductor tapes by the biaxial texturing using the cube textured Ni subst

高温超导体中晶界的取向控制和超导电流流动机制的阐明，使用立方织构镍基体的双轴织构开发高温超导带

基本信息

批准号：
15360333
负责人：
MATSUMOTO Kaname
金额：
$ 8.26万
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：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

YBa_2Cu_3O_x(YBCO) has long been considered a promising candidate for next superconducting conductors operated at 77K. Trial of YBCO tape manufacture is widely carried out, to utilize high performance of the YBCO material, by using the highly textured oxide buffer layer on the metal substrates. Since the crystal anisotropy is large and the coherence length is short for YBCO, the effect of the grain boundary is remarkable. The polycrystalline substance usually is used for making the long length tape so that the suppression of J_c in the grain boundary becomes big problem. It is indispensable to develop the biaxial orientation technology which levels the grain boundary angle of YBCO films on the metal substrates in 10 degree or less for utilizing the high performance of YBCO maximally.In order to solve this issue, we have fabricated biaxial textured Ni and Ni-Cr tapes, and crystal orientation and microstructure of CeO_2 films deposited on the tapes by pulsed laser deposition were investi … More gated. Recrystallized Ni-Cr tapes had a cube texture, {l00}<001> orientation, and the surface of the tapes was occupied by the (100) preferred orientation and the strong in-plane alignment. Although recrystallized Ni tapes exhibited the {100}<001> texture and the CeO_2 films subsequently deposited on the tapes also have (100) orientation, the preferred orientation of CeO_2 films was affected by the oxygen partial pressure during pulsed laser deposition and the degree of the (100) orientation pf CeO_2 films was improved with increase of the film thickness. Moreover, we measured the magnetic field angular dependence of J_c and studied the flux pinning properties of YBCO films. We confirmed that the substrate materials and deposition temperatures have influences on the introduction of the crystalline defects into YBCO thin films, resulting in the different field angular dependence of J_c. The result shows that the dislocation perpendicularly formed in the substrate gives large effect in J_c. In this way, the possibility of controlling J_c was obtained by introduction of the high density dislocation into YBCO films on the metal substrates. Less

YBA_2CU_3O_X（YBCO）长期以来一直被认为是下一个以77K运行的超导导体的承诺候选者。通过在金属底物上使用高质感的氧化物缓冲层，广泛进行了YBCO胶带制造的试验，以利用YBCO材料的高性能。由于晶体各向异性很大，YBCO的相干长度很短，因此晶界的效果显着。多晶底物通常用于制造长长的胶带，以使晶粒边界中的J_C抑制成为大问题。 It is indispensable to develop the biaxial orientation technology which levels the grain boundary angle of YBCO films on the metal substrates in 10 degree or less for using the high performance of YBCO maximum.In order to solve this issue, we have fabricated biaxial textured Ni and Ni-Cr tapes, and crystal orientation and microstructure of CeO_2 Films deposited on the tapes by pulsed laser deposition were investi... More封闭。重结晶的NI-CR磁带具有立方体纹理，{l00} <001>方向，并且磁带的表面被（100）首选方向和强平面内对齐占据。尽管重结晶的Ni磁带暴露了{100} <001>纹理，而CEO_2胶片随后存放在磁带上也（100）方向，但CEO_2膜的优选方向受到脉冲激光deposity of（100）的氧化度的氧气压力的影响（100）摄影（100）摄影（100）摄影效果。此外，我们测量了J_C的磁场角依赖性，并研究了YBCO膜的通量固定特性。我们证实，底物材料和沉积温度会影响将晶体缺陷引入YBCO薄膜中，从而导致J_C的磁场角依赖性不同。结果表明，底物中垂直形成的脱位在J_C中产生了很大的影响。这样，通过将高密度脱位引入金属底物上的YBCO膜中获得了控制J_C的可能性。较少的